JSFiddle - React, Tailwind, and code Playground

by booktu8

HTML

<div class="aa"></div>

CSS

.aa{
  width: 0;
  height: 0;
  border-top:50px solid red;
  border-right:50px solid transparent;
  border-bottom:50px solid transparent;
  border-left:50px solid #999;
  
  
}