JSFiddle - React, Tailwind, and code Playground

JavaScript

function randHex() {
    return (Math.floor(Math.random() * 56) + 200).toString(16);
}

function randColor() {
    return randHex() + "" + randHex() + "" + randHex();
}

var str = "";
for (var i = 0; i < 20; i++) {
    str += "<div style='background:#" + randColor() + "'>text</div>";
}

document.getElementsByTagName('body')[0].innerHTML = str;