JSFiddle - React, Tailwind, and code Playground

by Dmitriy Shvanyk

HTML

<header></header>
<section></section>

CSS

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

header,
section {
    min-height: 200px;
    position: relative;
}

header {
    background: blue;
}

header:before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 100px 0 0 100vw;
    border-color: transparent transparent transparent green;
}

section {
    background: green;
}