JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.container {
  display: flex;
  flex-wrap: wrap;
}
.left, .right {
  flex: 1 300px;
}



.left {
  background: #f55;
  min-height: 150px;
}

.right {
  background: #55f;
  min-height: 150px;
}