Flexbox - Fill remaining space [duplicate]

Answer 1

Is flexbox the best thing to use in this situation?

Yeah, it's a good idea to use flexbox in this situation.

To achieve your desired result, as I understand, you need to set height: 100% on #container so that it occupies all the space available to it. Then set flex-grow: 0 on .bottom so that it doesn't grow.

So your CSS should be:

#container {
  width:100%;
  height:100%;
  background:grey;
  display:flex;
  flex-direction:column;
}

.top {
  background:red;
  flex: 1 0 auto; // Grow, don't shrink
  padding:20px;
}

.bottom {
  background:yellow;
  flex: 0 0 auto; // don't grow, take up only needed space
  padding:20px;
}

Answer 2

The container is not set to 100% height. it's not tall enough. After you set the container to be height: 100%, you also have to set the flex-basis for each flex item. The bottom can be flex: 1 1 auto, but the top should be flex: 0 1 auto

body,html {
  height:100%;
  width:100%;
  margin: 0;
}

#container {
  width:100%;
  height: 100%;
  background:grey;
  display:flex;
  flex-direction:column;
}

.top {
  background:red;
  flex:1 1 auto;
  padding:20px;
}

.bottom {
  background:yellow;
  flex:0 1 auto;
  padding:20px;
}

<div id="container">
	<div class="top">
  Top Content
	</div>
	<div class="bottom">
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut venenatis, arcu vitae sollicitudin pellentesque, quam libero imperdiet urna, eu rhoncus lorem dolor sed neque. Donec ex risus, pretium ut maximus fringilla, euismod id mi. Phasellus ligula sem, iaculis ut urna eget, efficitur vulputate sem.
  </div>
</div>

Answer 3

First, you need to make the container occupy vertical space. height: 100%; will do that.

Second, if you want the title div not to be the same size as the following div, they shouldn't both be flex: 1;, in fact you probably want the title to be flex: 0;