JSFiddle - React, Tailwind, and code Playground

by Chris LaFrombois

HTML

<div class="a">

</div>

<div class="b">

</div>

CSS

:root {
  --static-width: 75%;
}

.b {
  width: var(--static-width);
  height: 20px;
  background: red;
}

.a {
  width: calc( var(--static-width) + 50px );
  height: 20px;
  background: blue;
}