JSFiddle - React, Tailwind, and code Playground

CSS

div{width:25px; height:25px; float:left; border:1px solid #ccc;}

JavaScript

function rand(min, max) {
    return parseInt(Math.random() * (max-min+1), 10) + min;
}

function get_random_color() {
    var h = rand(180, 250);
    var s = rand(30, 100);
    var l = rand(20, 70);
    return 'hsl(' + h + ',' + s + '%,' + l + '%)';
}

for (var i = 0; i < 500; i++) {
    var div = document.createElement('div');
    div.style.backgroundColor = get_random_color();
    document.body.appendChild(div);
}