JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
  <div class="col left">Left</div>
   <div class="col">Right</div>
</div>

CSS

* {
  margin: 0;
  padding: 0;
}

#container {
  font-size: 0;
  width: 100%;
}

.col {
  font-size: 1rem; background-color: red;
  width: 50%;
  display: inline-block;
}

.left {
background-color: blue;  
}