JSFiddle - React, Tailwind, and code Playground

by Alexander Zonov

HTML

<div class="angle">
  <div class="big"></div>
  <div class="small"></div>
</div>

CSS

.angle {
  position: relative;
}

.big {
  top: 0;
  left: 0;
  position: absolute;
  width: 0;
  height: 0;
  border: 25px solid transparent;
  border-left: 25px solid black;
}