JSFiddle - React, Tailwind, and code Playground

by Slava Fomin II

HTML

<div class="arrow-up"></div>

CSS

.arrow-up {
  width: 0; 
  height: 100px; 
  border-left: 100px solid red;
  border-right: 100px solid lime;
  
  border-bottom: 100px solid black;
}