JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="wrapper">
    <div class="column width50 height100 pink"></div>
    <div class="column width50 height100">
      <div class="wrapper">
        <div class="column width100 height50 orange">
          <div class="item top">
            <h1>TOP</h1>
          </div>
        </div>
        <div class="column width100 height50 yellow">
          <div class="item bottom">
            <h1>BOTTOM</h1>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

CSS

.container {
  height: 100vh;
  margin: 0 auto;
  max-width: 960px;
  min-height: 360px;
}
.wrapper {
  width: 100%;
  height: 100%;
}
.wrapper::after {
  content: "";
  display: block;
  clear: both;
}
.column {
  position: relative;
  float: left;
}
.width100 {
  width: 100%;
}
.width50 {
  width: 50%;
}
.height100 {
  height: 100%;
}
.height50 {
  height: 50%
}
.orange {
  background: orange;
}
.pink {
  background: pink;
}
.yellow {
  background: yellow;
}
.item {
  position: absolute;
  width: 100%;
  text-align: center;
  overflow: hidden;
}
.top {
  top: 0;
}
.bottom {
  bottom: 0;
}
h1 {
  background: blue;
  color: white;
}