JSFiddle - React, Tailwind, and code Playground

HTML

<div class="object"></div>

CSS

.object {
        width: 100px;
        height: 100px;
        position: relative;
        top: 0px;
        left: 0px;
        background-color: white;
        border: 1px solid;
}

JavaScript

function RGB2HTML(red, green, blue)
{
    var decColor =0x1000000+ blue + 0x100 * green + 0x10000 *red ;
    return '#'+decColor.toString(16).substr(1);
}


window.onload = function(){   
    var currentColor='white';
    var red = 0;
    var green = 0;
    var blue =0;
    setInterval(function(){
        $('.object').style.top += 10px;
        $('.object').style.left += 10px;
        $('.object').style.background-color = RGB2HTML(red+10; green+10; blue+10)
    }, 1000);
};