JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="child">1</div>
  <div class="child">2</div>
</div>

CSS

.container {
  width: 500px;
  height: 400px;
  border: 1px solid black;
  float: left;
}
.child {
  width: 400px;
  height: 300px;
  border: 1px dotted blue;
  float: left;
  margin-right: -100%;
  position: relative;
}