Child div 100% height to parent auto height

Question

Im here because other similar questions couldn\'t help my particular problem.

I need right div to be 100% height all the time, where the parent

Answer 1

You can accomplish this using flexbox and some creativity.

.container {
  display: flex;
  background: black;
  padding: 5px;
  width: 300px
}

.left {
  height: 200px;
  flex: 1 0 0px;
  background: blue;
}

.right {
  flex: 1 0 0px;
  overflow: auto;
  background: green;
}

.column {
  display: flex;
  flex-direction: column;
  width: 20%;
}

<div class="container">
  <div class="left"></div>
  <div class="column">
    <div class="right"></div>
  </div>
</div>