JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

html,
body {
    margin: 0;
    height: 100%;
}

section {
    height: 50%;
    background-image: linear-gradient(to bottom right, transparent 48%, #000 48%, #000 52%, transparent 52%);
}
section:nth-child(even) {
    background-color: #f4f4f4;
    background-image: linear-gradient(to bottom left, transparent 48%, #000 48%, #000 52%, transparent 52%);
}