<div class="container" >
  <div class="box">
    CSS
  </div>
  <div class="box">
    javascript
  </div>
</div>
.container{
  height: 120px;
}
.box {
  display: inline-block;
  width: 100px;
    height: -webkit-fill-available;
    height: -moz-fill-available;
    height: -moz-available;
    height: fill-available;
    background-color: pink;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.