JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>

<div class="triangle"></div>

</body>
</html>

CSS

.triangle {
    width: 0;
    height: 0;
    border-top: 0;
    border-bottom: 20px solid #666699;
    border-left: 20px solid transparent; 
    border-right: 20px solid transparent;
    -moz-transform: scaleY(1.5);
    -moz-transform-origin: top;
    }