Here's an example JavaScript code snippet to set random website background colors. In this case, we will choose a random string (color) from an array and set it as the background color of the <body> tag.

<script>

var bgcolor = function(param) {
    var names = ['f5deb3','fab1a0','BDC581','9AECDB','CAD3C8', 'ffcccc'];
    var random=  Math.floor((Math.random() * names.length));
    var randomColor = names[random];

    const addCSS = css =&gt; document.head.appendChild(document.createElement("style")).innerHTML=css;
    addCSS("body  { background:#" + randomColor + "!important; }")       

};

bgcolor({
});


</script>

Cover Photo by Joan Gamell on Unsplash