JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="one">
    one
  </div>
  <div class="two">
    two
  </div>
</div>

CSS

.container {
  display: flex;
}

.one {
  width: 100%;
  background: lightBlue;
}

.two {
  width: 100%;
  background: darkBlue;
}