Empty div is invisible









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0
down vote

favorite












I have a div that has a few css styles so that it fits on the page without having to scroll the page






chatForm.addEventListener('submit', function(e)
e.preventDefault()
//sends message

);

#chat 
width:100%;
height:100%;

#messagebox
border: 0;
padding: 10px;
width: 90%;
height:10%;
margin:0;
float:left;

.submitButton
padding:10px;
width: 10%;
height:10%;
background: #003;
float:right;
border:0;
color:white;
cursor: pointer;

.submitButton:hover
background:#033

#messages
width:100%;
height:90%;
margin:0;
overflow:auto;

#messages p
padding: 5px 10px;
background: lightblue;
color:white;

#messages p:nth-child(odd)
background: white;
color:lightblue;

#messages p .deleteButton
background: white;
color:lightblue;

#messages p:nth-child(odd) .deleteButton
background: lightblue;
color:white;

<div id="chat">
<div id="messages">
<p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
</div>
<form id="chatForm">
<input id="messagebox" required/>
<button class="submitButton">
Send
</button>
</form>
</div>





Inside this div is nothing. However, it adds <p> whenever it receives a message from the server. Once it fills, it should have scroll bars that stop it from being too tall. However, this doesn't happen and it continues to fill. It's also invisible when empty. I have searched google and stackoverflow to no avail. Can someone help me understand why my css styles aren't working?



PS: The javascript is just there so it doesn't reload when you click the send button










share|improve this question























  • Since you're using percentages, you have to make sure that the html/body tags also have a width and height of 100%.
    – Jacques
    Nov 9 at 19:03










  • ok whatever. Wait a minute, did you honestly just comment on my question so that you could reply to me?
    – Electrox Mortem
    Nov 10 at 4:48










  • @DaveNewton Also, it's listed in my developer story that I'm a mean person.
    – Electrox Mortem
    Nov 10 at 4:50










  • @DaveNewton For the intentions of the question that was asked, it seemed to be quite incorrect. Expecially since they were asking for a function called reduce, which according to the underline.js docs, was a function for arrays only. What's an FWIW???
    – Electrox Mortem
    Nov 10 at 5:16











  • Hm. Ok. Goodnight
    – Electrox Mortem
    Nov 10 at 5:27














up vote
0
down vote

favorite












I have a div that has a few css styles so that it fits on the page without having to scroll the page






chatForm.addEventListener('submit', function(e)
e.preventDefault()
//sends message

);

#chat 
width:100%;
height:100%;

#messagebox
border: 0;
padding: 10px;
width: 90%;
height:10%;
margin:0;
float:left;

.submitButton
padding:10px;
width: 10%;
height:10%;
background: #003;
float:right;
border:0;
color:white;
cursor: pointer;

.submitButton:hover
background:#033

#messages
width:100%;
height:90%;
margin:0;
overflow:auto;

#messages p
padding: 5px 10px;
background: lightblue;
color:white;

#messages p:nth-child(odd)
background: white;
color:lightblue;

#messages p .deleteButton
background: white;
color:lightblue;

#messages p:nth-child(odd) .deleteButton
background: lightblue;
color:white;

<div id="chat">
<div id="messages">
<p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
</div>
<form id="chatForm">
<input id="messagebox" required/>
<button class="submitButton">
Send
</button>
</form>
</div>





Inside this div is nothing. However, it adds <p> whenever it receives a message from the server. Once it fills, it should have scroll bars that stop it from being too tall. However, this doesn't happen and it continues to fill. It's also invisible when empty. I have searched google and stackoverflow to no avail. Can someone help me understand why my css styles aren't working?



PS: The javascript is just there so it doesn't reload when you click the send button










share|improve this question























  • Since you're using percentages, you have to make sure that the html/body tags also have a width and height of 100%.
    – Jacques
    Nov 9 at 19:03










  • ok whatever. Wait a minute, did you honestly just comment on my question so that you could reply to me?
    – Electrox Mortem
    Nov 10 at 4:48










  • @DaveNewton Also, it's listed in my developer story that I'm a mean person.
    – Electrox Mortem
    Nov 10 at 4:50










  • @DaveNewton For the intentions of the question that was asked, it seemed to be quite incorrect. Expecially since they were asking for a function called reduce, which according to the underline.js docs, was a function for arrays only. What's an FWIW???
    – Electrox Mortem
    Nov 10 at 5:16











  • Hm. Ok. Goodnight
    – Electrox Mortem
    Nov 10 at 5:27












up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have a div that has a few css styles so that it fits on the page without having to scroll the page






chatForm.addEventListener('submit', function(e)
e.preventDefault()
//sends message

);

#chat 
width:100%;
height:100%;

#messagebox
border: 0;
padding: 10px;
width: 90%;
height:10%;
margin:0;
float:left;

.submitButton
padding:10px;
width: 10%;
height:10%;
background: #003;
float:right;
border:0;
color:white;
cursor: pointer;

.submitButton:hover
background:#033

#messages
width:100%;
height:90%;
margin:0;
overflow:auto;

#messages p
padding: 5px 10px;
background: lightblue;
color:white;

#messages p:nth-child(odd)
background: white;
color:lightblue;

#messages p .deleteButton
background: white;
color:lightblue;

#messages p:nth-child(odd) .deleteButton
background: lightblue;
color:white;

<div id="chat">
<div id="messages">
<p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
</div>
<form id="chatForm">
<input id="messagebox" required/>
<button class="submitButton">
Send
</button>
</form>
</div>





Inside this div is nothing. However, it adds <p> whenever it receives a message from the server. Once it fills, it should have scroll bars that stop it from being too tall. However, this doesn't happen and it continues to fill. It's also invisible when empty. I have searched google and stackoverflow to no avail. Can someone help me understand why my css styles aren't working?



PS: The javascript is just there so it doesn't reload when you click the send button










share|improve this question















I have a div that has a few css styles so that it fits on the page without having to scroll the page






chatForm.addEventListener('submit', function(e)
e.preventDefault()
//sends message

);

#chat 
width:100%;
height:100%;

#messagebox
border: 0;
padding: 10px;
width: 90%;
height:10%;
margin:0;
float:left;

.submitButton
padding:10px;
width: 10%;
height:10%;
background: #003;
float:right;
border:0;
color:white;
cursor: pointer;

.submitButton:hover
background:#033

#messages
width:100%;
height:90%;
margin:0;
overflow:auto;

#messages p
padding: 5px 10px;
background: lightblue;
color:white;

#messages p:nth-child(odd)
background: white;
color:lightblue;

#messages p .deleteButton
background: white;
color:lightblue;

#messages p:nth-child(odd) .deleteButton
background: lightblue;
color:white;

<div id="chat">
<div id="messages">
<p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
</div>
<form id="chatForm">
<input id="messagebox" required/>
<button class="submitButton">
Send
</button>
</form>
</div>





Inside this div is nothing. However, it adds <p> whenever it receives a message from the server. Once it fills, it should have scroll bars that stop it from being too tall. However, this doesn't happen and it continues to fill. It's also invisible when empty. I have searched google and stackoverflow to no avail. Can someone help me understand why my css styles aren't working?



PS: The javascript is just there so it doesn't reload when you click the send button






chatForm.addEventListener('submit', function(e)
e.preventDefault()
//sends message

);

#chat 
width:100%;
height:100%;

#messagebox
border: 0;
padding: 10px;
width: 90%;
height:10%;
margin:0;
float:left;

.submitButton
padding:10px;
width: 10%;
height:10%;
background: #003;
float:right;
border:0;
color:white;
cursor: pointer;

.submitButton:hover
background:#033

#messages
width:100%;
height:90%;
margin:0;
overflow:auto;

#messages p
padding: 5px 10px;
background: lightblue;
color:white;

#messages p:nth-child(odd)
background: white;
color:lightblue;

#messages p .deleteButton
background: white;
color:lightblue;

#messages p:nth-child(odd) .deleteButton
background: lightblue;
color:white;

<div id="chat">
<div id="messages">
<p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
</div>
<form id="chatForm">
<input id="messagebox" required/>
<button class="submitButton">
Send
</button>
</form>
</div>





chatForm.addEventListener('submit', function(e)
e.preventDefault()
//sends message

);

#chat 
width:100%;
height:100%;

#messagebox
border: 0;
padding: 10px;
width: 90%;
height:10%;
margin:0;
float:left;

.submitButton
padding:10px;
width: 10%;
height:10%;
background: #003;
float:right;
border:0;
color:white;
cursor: pointer;

.submitButton:hover
background:#033

#messages
width:100%;
height:90%;
margin:0;
overflow:auto;

#messages p
padding: 5px 10px;
background: lightblue;
color:white;

#messages p:nth-child(odd)
background: white;
color:lightblue;

#messages p .deleteButton
background: white;
color:lightblue;

#messages p:nth-child(odd) .deleteButton
background: lightblue;
color:white;

<div id="chat">
<div id="messages">
<p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
</div>
<form id="chatForm">
<input id="messagebox" required/>
<button class="submitButton">
Send
</button>
</form>
</div>






html css






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 9 at 21:57









lgwilliams

296313




296313










asked Nov 9 at 19:00









Electrox Mortem

14713




14713











  • Since you're using percentages, you have to make sure that the html/body tags also have a width and height of 100%.
    – Jacques
    Nov 9 at 19:03










  • ok whatever. Wait a minute, did you honestly just comment on my question so that you could reply to me?
    – Electrox Mortem
    Nov 10 at 4:48










  • @DaveNewton Also, it's listed in my developer story that I'm a mean person.
    – Electrox Mortem
    Nov 10 at 4:50










  • @DaveNewton For the intentions of the question that was asked, it seemed to be quite incorrect. Expecially since they were asking for a function called reduce, which according to the underline.js docs, was a function for arrays only. What's an FWIW???
    – Electrox Mortem
    Nov 10 at 5:16











  • Hm. Ok. Goodnight
    – Electrox Mortem
    Nov 10 at 5:27
















  • Since you're using percentages, you have to make sure that the html/body tags also have a width and height of 100%.
    – Jacques
    Nov 9 at 19:03










  • ok whatever. Wait a minute, did you honestly just comment on my question so that you could reply to me?
    – Electrox Mortem
    Nov 10 at 4:48










  • @DaveNewton Also, it's listed in my developer story that I'm a mean person.
    – Electrox Mortem
    Nov 10 at 4:50










  • @DaveNewton For the intentions of the question that was asked, it seemed to be quite incorrect. Expecially since they were asking for a function called reduce, which according to the underline.js docs, was a function for arrays only. What's an FWIW???
    – Electrox Mortem
    Nov 10 at 5:16











  • Hm. Ok. Goodnight
    – Electrox Mortem
    Nov 10 at 5:27















Since you're using percentages, you have to make sure that the html/body tags also have a width and height of 100%.
– Jacques
Nov 9 at 19:03




Since you're using percentages, you have to make sure that the html/body tags also have a width and height of 100%.
– Jacques
Nov 9 at 19:03












ok whatever. Wait a minute, did you honestly just comment on my question so that you could reply to me?
– Electrox Mortem
Nov 10 at 4:48




ok whatever. Wait a minute, did you honestly just comment on my question so that you could reply to me?
– Electrox Mortem
Nov 10 at 4:48












@DaveNewton Also, it's listed in my developer story that I'm a mean person.
– Electrox Mortem
Nov 10 at 4:50




@DaveNewton Also, it's listed in my developer story that I'm a mean person.
– Electrox Mortem
Nov 10 at 4:50












@DaveNewton For the intentions of the question that was asked, it seemed to be quite incorrect. Expecially since they were asking for a function called reduce, which according to the underline.js docs, was a function for arrays only. What's an FWIW???
– Electrox Mortem
Nov 10 at 5:16





@DaveNewton For the intentions of the question that was asked, it seemed to be quite incorrect. Expecially since they were asking for a function called reduce, which according to the underline.js docs, was a function for arrays only. What's an FWIW???
– Electrox Mortem
Nov 10 at 5:16













Hm. Ok. Goodnight
– Electrox Mortem
Nov 10 at 5:27




Hm. Ok. Goodnight
– Electrox Mortem
Nov 10 at 5:27












2 Answers
2






active

oldest

votes

















up vote
2
down vote



accepted










Probably you didn't define this:



html, body 
height: 100%;



And the same for any other element between body and #chat- the 100% height need a reference.



Without that, that DIV is only as high as it's content, so if there is no content, it will remain invisible....






share|improve this answer






















  • Whymst does yu keep editting my stuff and not telling me what it is you did?!?!
    – Electrox Mortem
    Nov 9 at 19:18










  • @JermahlWhite If you click the "Edited X mins ago" above the editor's name, it shows you a diff of the of the changes.
    – Tyler Roper
    Nov 9 at 19:21










  • Oh. oof. Thanks for telling me this
    – Electrox Mortem
    Nov 9 at 19:23

















up vote
0
down vote













Body looks to its parent (HTML) for how to scale the dynamic property, so the HTML element needs to have its height set as well.



However, the content of body will probably need to change dynamically. Setting height to 100% will accomplish your goal.






chatForm.addEventListener('submit', function(e)
e.preventDefault()
//sends message

);

html, body 
height:100%;


#chat
width:100%;
height:100%;

#messagebox
border: 0;
padding: 10px;
width: 90%;
height:10%;
margin:0;
float:left;

.submitButton
padding:10px;
width: 10%;
height:10%;
background: #003;
float:right;
border:0;
color:white;
cursor: pointer;

.submitButton:hover
background:#033

#messages
width:100%;
height:90%;
margin:0;
overflow:auto;

#messages p
padding: 5px 10px;
background: lightblue;
color:white;

#messages p:nth-child(odd)
background: white;
color:lightblue;

#messages p .deleteButton
background: white;
color:lightblue;

#messages p:nth-child(odd) .deleteButton
background: lightblue;
color:white;

<div id="chat">
<div id="messages">
<p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
</div>
<form id="chatForm">
<input id="messagebox" required/>
<button class="submitButton">
Send
</button>
</form>
</div>








share|improve this answer




















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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    2
    down vote



    accepted










    Probably you didn't define this:



    html, body 
    height: 100%;



    And the same for any other element between body and #chat- the 100% height need a reference.



    Without that, that DIV is only as high as it's content, so if there is no content, it will remain invisible....






    share|improve this answer






















    • Whymst does yu keep editting my stuff and not telling me what it is you did?!?!
      – Electrox Mortem
      Nov 9 at 19:18










    • @JermahlWhite If you click the "Edited X mins ago" above the editor's name, it shows you a diff of the of the changes.
      – Tyler Roper
      Nov 9 at 19:21










    • Oh. oof. Thanks for telling me this
      – Electrox Mortem
      Nov 9 at 19:23














    up vote
    2
    down vote



    accepted










    Probably you didn't define this:



    html, body 
    height: 100%;



    And the same for any other element between body and #chat- the 100% height need a reference.



    Without that, that DIV is only as high as it's content, so if there is no content, it will remain invisible....






    share|improve this answer






















    • Whymst does yu keep editting my stuff and not telling me what it is you did?!?!
      – Electrox Mortem
      Nov 9 at 19:18










    • @JermahlWhite If you click the "Edited X mins ago" above the editor's name, it shows you a diff of the of the changes.
      – Tyler Roper
      Nov 9 at 19:21










    • Oh. oof. Thanks for telling me this
      – Electrox Mortem
      Nov 9 at 19:23












    up vote
    2
    down vote



    accepted







    up vote
    2
    down vote



    accepted






    Probably you didn't define this:



    html, body 
    height: 100%;



    And the same for any other element between body and #chat- the 100% height need a reference.



    Without that, that DIV is only as high as it's content, so if there is no content, it will remain invisible....






    share|improve this answer














    Probably you didn't define this:



    html, body 
    height: 100%;



    And the same for any other element between body and #chat- the 100% height need a reference.



    Without that, that DIV is only as high as it's content, so if there is no content, it will remain invisible....







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited Nov 9 at 19:16

























    answered Nov 9 at 19:03









    Johannes

    36.1k92764




    36.1k92764











    • Whymst does yu keep editting my stuff and not telling me what it is you did?!?!
      – Electrox Mortem
      Nov 9 at 19:18










    • @JermahlWhite If you click the "Edited X mins ago" above the editor's name, it shows you a diff of the of the changes.
      – Tyler Roper
      Nov 9 at 19:21










    • Oh. oof. Thanks for telling me this
      – Electrox Mortem
      Nov 9 at 19:23
















    • Whymst does yu keep editting my stuff and not telling me what it is you did?!?!
      – Electrox Mortem
      Nov 9 at 19:18










    • @JermahlWhite If you click the "Edited X mins ago" above the editor's name, it shows you a diff of the of the changes.
      – Tyler Roper
      Nov 9 at 19:21










    • Oh. oof. Thanks for telling me this
      – Electrox Mortem
      Nov 9 at 19:23















    Whymst does yu keep editting my stuff and not telling me what it is you did?!?!
    – Electrox Mortem
    Nov 9 at 19:18




    Whymst does yu keep editting my stuff and not telling me what it is you did?!?!
    – Electrox Mortem
    Nov 9 at 19:18












    @JermahlWhite If you click the "Edited X mins ago" above the editor's name, it shows you a diff of the of the changes.
    – Tyler Roper
    Nov 9 at 19:21




    @JermahlWhite If you click the "Edited X mins ago" above the editor's name, it shows you a diff of the of the changes.
    – Tyler Roper
    Nov 9 at 19:21












    Oh. oof. Thanks for telling me this
    – Electrox Mortem
    Nov 9 at 19:23




    Oh. oof. Thanks for telling me this
    – Electrox Mortem
    Nov 9 at 19:23












    up vote
    0
    down vote













    Body looks to its parent (HTML) for how to scale the dynamic property, so the HTML element needs to have its height set as well.



    However, the content of body will probably need to change dynamically. Setting height to 100% will accomplish your goal.






    chatForm.addEventListener('submit', function(e)
    e.preventDefault()
    //sends message

    );

    html, body 
    height:100%;


    #chat
    width:100%;
    height:100%;

    #messagebox
    border: 0;
    padding: 10px;
    width: 90%;
    height:10%;
    margin:0;
    float:left;

    .submitButton
    padding:10px;
    width: 10%;
    height:10%;
    background: #003;
    float:right;
    border:0;
    color:white;
    cursor: pointer;

    .submitButton:hover
    background:#033

    #messages
    width:100%;
    height:90%;
    margin:0;
    overflow:auto;

    #messages p
    padding: 5px 10px;
    background: lightblue;
    color:white;

    #messages p:nth-child(odd)
    background: white;
    color:lightblue;

    #messages p .deleteButton
    background: white;
    color:lightblue;

    #messages p:nth-child(odd) .deleteButton
    background: lightblue;
    color:white;

    <div id="chat">
    <div id="messages">
    <p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
    </div>
    <form id="chatForm">
    <input id="messagebox" required/>
    <button class="submitButton">
    Send
    </button>
    </form>
    </div>








    share|improve this answer
























      up vote
      0
      down vote













      Body looks to its parent (HTML) for how to scale the dynamic property, so the HTML element needs to have its height set as well.



      However, the content of body will probably need to change dynamically. Setting height to 100% will accomplish your goal.






      chatForm.addEventListener('submit', function(e)
      e.preventDefault()
      //sends message

      );

      html, body 
      height:100%;


      #chat
      width:100%;
      height:100%;

      #messagebox
      border: 0;
      padding: 10px;
      width: 90%;
      height:10%;
      margin:0;
      float:left;

      .submitButton
      padding:10px;
      width: 10%;
      height:10%;
      background: #003;
      float:right;
      border:0;
      color:white;
      cursor: pointer;

      .submitButton:hover
      background:#033

      #messages
      width:100%;
      height:90%;
      margin:0;
      overflow:auto;

      #messages p
      padding: 5px 10px;
      background: lightblue;
      color:white;

      #messages p:nth-child(odd)
      background: white;
      color:lightblue;

      #messages p .deleteButton
      background: white;
      color:lightblue;

      #messages p:nth-child(odd) .deleteButton
      background: lightblue;
      color:white;

      <div id="chat">
      <div id="messages">
      <p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
      </div>
      <form id="chatForm">
      <input id="messagebox" required/>
      <button class="submitButton">
      Send
      </button>
      </form>
      </div>








      share|improve this answer






















        up vote
        0
        down vote










        up vote
        0
        down vote









        Body looks to its parent (HTML) for how to scale the dynamic property, so the HTML element needs to have its height set as well.



        However, the content of body will probably need to change dynamically. Setting height to 100% will accomplish your goal.






        chatForm.addEventListener('submit', function(e)
        e.preventDefault()
        //sends message

        );

        html, body 
        height:100%;


        #chat
        width:100%;
        height:100%;

        #messagebox
        border: 0;
        padding: 10px;
        width: 90%;
        height:10%;
        margin:0;
        float:left;

        .submitButton
        padding:10px;
        width: 10%;
        height:10%;
        background: #003;
        float:right;
        border:0;
        color:white;
        cursor: pointer;

        .submitButton:hover
        background:#033

        #messages
        width:100%;
        height:90%;
        margin:0;
        overflow:auto;

        #messages p
        padding: 5px 10px;
        background: lightblue;
        color:white;

        #messages p:nth-child(odd)
        background: white;
        color:lightblue;

        #messages p .deleteButton
        background: white;
        color:lightblue;

        #messages p:nth-child(odd) .deleteButton
        background: lightblue;
        color:white;

        <div id="chat">
        <div id="messages">
        <p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
        </div>
        <form id="chatForm">
        <input id="messagebox" required/>
        <button class="submitButton">
        Send
        </button>
        </form>
        </div>








        share|improve this answer












        Body looks to its parent (HTML) for how to scale the dynamic property, so the HTML element needs to have its height set as well.



        However, the content of body will probably need to change dynamically. Setting height to 100% will accomplish your goal.






        chatForm.addEventListener('submit', function(e)
        e.preventDefault()
        //sends message

        );

        html, body 
        height:100%;


        #chat
        width:100%;
        height:100%;

        #messagebox
        border: 0;
        padding: 10px;
        width: 90%;
        height:10%;
        margin:0;
        float:left;

        .submitButton
        padding:10px;
        width: 10%;
        height:10%;
        background: #003;
        float:right;
        border:0;
        color:white;
        cursor: pointer;

        .submitButton:hover
        background:#033

        #messages
        width:100%;
        height:90%;
        margin:0;
        overflow:auto;

        #messages p
        padding: 5px 10px;
        background: lightblue;
        color:white;

        #messages p:nth-child(odd)
        background: white;
        color:lightblue;

        #messages p .deleteButton
        background: white;
        color:lightblue;

        #messages p:nth-child(odd) .deleteButton
        background: lightblue;
        color:white;

        <div id="chat">
        <div id="messages">
        <p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
        </div>
        <form id="chatForm">
        <input id="messagebox" required/>
        <button class="submitButton">
        Send
        </button>
        </form>
        </div>








        chatForm.addEventListener('submit', function(e)
        e.preventDefault()
        //sends message

        );

        html, body 
        height:100%;


        #chat
        width:100%;
        height:100%;

        #messagebox
        border: 0;
        padding: 10px;
        width: 90%;
        height:10%;
        margin:0;
        float:left;

        .submitButton
        padding:10px;
        width: 10%;
        height:10%;
        background: #003;
        float:right;
        border:0;
        color:white;
        cursor: pointer;

        .submitButton:hover
        background:#033

        #messages
        width:100%;
        height:90%;
        margin:0;
        overflow:auto;

        #messages p
        padding: 5px 10px;
        background: lightblue;
        color:white;

        #messages p:nth-child(odd)
        background: white;
        color:lightblue;

        #messages p .deleteButton
        background: white;
        color:lightblue;

        #messages p:nth-child(odd) .deleteButton
        background: lightblue;
        color:white;

        <div id="chat">
        <div id="messages">
        <p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
        </div>
        <form id="chatForm">
        <input id="messagebox" required/>
        <button class="submitButton">
        Send
        </button>
        </form>
        </div>





        chatForm.addEventListener('submit', function(e)
        e.preventDefault()
        //sends message

        );

        html, body 
        height:100%;


        #chat
        width:100%;
        height:100%;

        #messagebox
        border: 0;
        padding: 10px;
        width: 90%;
        height:10%;
        margin:0;
        float:left;

        .submitButton
        padding:10px;
        width: 10%;
        height:10%;
        background: #003;
        float:right;
        border:0;
        color:white;
        cursor: pointer;

        .submitButton:hover
        background:#033

        #messages
        width:100%;
        height:90%;
        margin:0;
        overflow:auto;

        #messages p
        padding: 5px 10px;
        background: lightblue;
        color:white;

        #messages p:nth-child(odd)
        background: white;
        color:lightblue;

        #messages p .deleteButton
        background: white;
        color:lightblue;

        #messages p:nth-child(odd) .deleteButton
        background: lightblue;
        color:white;

        <div id="chat">
        <div id="messages">
        <p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p><p>Example Message</p>
        </div>
        <form id="chatForm">
        <input id="messagebox" required/>
        <button class="submitButton">
        Send
        </button>
        </form>
        </div>






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 9 at 19:16









        Michal

        2,0491135




        2,0491135



























             

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