JSFiddle - React, Tailwind, and code Playground

by amindunited

HTML

<div class="ex-1">
Hey
</div>

CSS

:root {
  --red: 256, 0, 0;
}
.ex-1 {
  width: 50%;
  height: 4rem;
  background-color: rgba(var(--red), 0.5);
}