CSS Div Fill Remaining Height

Make a div fill the height of the remaining screen space

2015 update: the flexbox approach

There are two other answers briefly mentioning flexbox; however, that was more than two years ago, and they don't provide any examples. The specification for flexbox has definitely settled now.

Note: Though CSS Flexible Boxes Layout specification is at the Candidate Recommendation stage, not all browsers have implemented it. WebKit implementation must be prefixed with -webkit-; Internet Explorer implements an old version of the spec, prefixed with -ms-; Opera 12.10 implements the latest version of the spec, unprefixed. See the compatibility table on each property for an up-to-date compatibility status.

(taken from https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Flexible_boxes)

All major browsers and IE11+ support Flexbox. For IE 10 or older, you can use the FlexieJS shim.

To check current support you can also see here:
http://caniuse.com/#feat=flexbox

Working example

With flexbox you can easily switch between any of your rows or columns either having fixed dimensions, content-sized dimensions or remaining-space dimensions. In my example I have set the header to snap to its content (as per the OPs question), I've added a footer to show how to add a fixed-height region and then set the content area to fill up the remaining space.

html,

body {

  height: 100%;

  margin: 0;

}

.box {

  display: flex;

  flex-flow: column;

  height: 100%;

}

.box .row {

  border: 1px dotted grey;

}

.box .row.header {

  flex: 0 1 auto;

  /* The above is shorthand for:

  flex-grow: 0,

  flex-shrink: 1,

  flex-basis: auto

  */

}

.box .row.content {

  flex: 1 1 auto;

}

.box .row.footer {

  flex: 0 1 40px;

}

<!-- Obviously, you could use HTML5 tags like `header`, `footer` and `section` -->

<div class="box">

  <div class="row header">

    <p><b>header</b>

      <br />

      <br />(sized to content)</p>

  </div>

  <div class="row content">

    <p>

      <b>content</b>

      (fills remaining space)

    </p>

  </div>

  <div class="row footer">

    <p><b>footer</b> (fixed height)</p>

  </div>

</div>

Make inner div fill remaining height using flex

I edited @Sfili_81's answer and added these to the *

margin: 0;
padding: 0;

Here's the entire code

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.home-content {
  display: flex;
  border: 1px solid black;
  height: 100vh;
  flex-flow: column;
}

.container {
  flex: 1;
  display: flex;
  flex-direction: column;
  border: 1px solid red;
}

#listItems {
  border: 3px solid green;
  flex: 1 1 100%;
}

<div class="home-section">
  <div class="home-content">
    <div class="container">
      <form>
        <label for="example">Input</label>
        <input type="text" name="example">
      </form>
      <div id="listItems">

      </div>
    </div>
  </div>
</div>

CSS Div fill remaining height

Give the container:

display:flex;
flex-direction:column;

and for the element:

flex:1;

The demo:
https://jsfiddle.net/ugjfwbg4/1/

body {

  background-color: red;

  height: 100%;

}

.wrap {

  height: 100vh;

  width: 100%;

  padding: 20px;

  background-color: yellow;

  display:flex;

  flex-direction:column;

}

.top {

  width: 100%;

  height: 50px;

  background-color: blue;

}

.mid {

  width: 100%;

  background-color: green;

  flex:1;

  display:flex;

  flex-direction:column;

}

.left{

  flex:1;

  width: 50%;

  background-color: red;

}

.bottom {

  width: 100%;

  height: 50px;

  background-color: blue;

}

<div class="wrap">

  <div class="top"></div>

  <div class="mid">

    

    <div class="left">left</div>

  </div>

  <div class="bottom"></div>

</div>

How to fill 100% of remaining height?

You should be able to do this if you add in a div (#header below) to wrap your contents of 1.

If you float #header, the content from #someid will be forced to flow around it.
Next, you set #header's width to 100%. This will make it expand to fill the width of the containing div, #full. This will effectively push all of #someid's content below #header since there is no room to flow around the sides anymore.
Finally, set #someid's height to 100%, this will make it the same height as #full.

JSFiddle

HTML

<div id="full">
    <div id="header">Contents of 1</div>
    <div id="someid">Contents of 2</div>
</div>

CSS

html, body, #full, #someid {
  height: 100%;
}

#header {
  float: left;
  width: 100%;
}

Update

I think it's worth mentioning that flexbox is well supported across modern browsers today. The CSS could be altered have #full become a flex container, and #someid should set it's flex grow to a value greater than 0.

html, body, #full {
  height: 100%;
}

#full {
  display: flex;
  flex-direction: column;
}

#someid {
  flex-grow: 1;
}

CSS: How to make div fill remaining height inside of a flex-child

It would be more helpful when you would of provided your existing CSS to better understand what you are trying to do. However I hope the example below will help you figure out how to solve what you are trying to accomplish.

Html:

<div class="flex-parent-row">
   <div class="flex-child">
      <div class="auto-height"> auto div</div>
      <div class="i-want-this-one-to-fill-remaining-height"> fill remaining div</div>
   </div>
</div>

CSS:

.flex-parent-row {
    display: flex;
    flex-direction: column;
    height: 200px;
    width: 500px;
    border: 1px solid #000;
 }
.flex-child {
    border: 1px solid #000;
    background-color: red;
    display: flex;  
    flex-direction: column;
    flex-grow: 1; 
 }
 .auto-height {
    background: orange;
 }

 .i-want-this-one-to-fill-remaining-height {
    flex-grow: 1;
    background-color: lightblue;
 }

If you need additional help please provide more code.

Fill remaining div height with image

Please define the background settings in order. That was the issue, your CSS itself works fine, I made one small change, I set margins for body and html tag to 0, this removed the scrollbar, you can either use this change or leave it.

Check my below DEMO.

JSFiddle Demo