JSFiddle - React, Tailwind, and code Playground

HTML

<div class="dleft"></div>

CSS

.dleft {
  width: 0;
  height: 0;
  border: 30px solid transparent;
  border-top-color: red;
  border-right-color: green;
  border-bottom-color: blue;
  border-left-color: yellow;
}