JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
    background: linear-gradient(to bottom, black 0%, black 20%,
                                           white 20%, white 40%,
                                           black 40%, black 60%,
                                           white 60%, white 80%,
                                           black 80%, black 100%);
    width: 100px;
    height: 100px;
}