JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
  <div class="palette"></div>
</div>

CSS

.wrapper {
  background-color: #92A58B;
  width: 100vw;
  height: 100vh;
}

.palette {
  width: 80vw;
  height: 2em;
  border: thin solid #444;
  margin: 2em auto;
}