JSFiddle - React, Tailwind, and code Playground
HTML
<div id="first"></div>
<div id="second"></div>
CSS
div {width:50px;height:50px;border-radius:25px;position:absolute}
#first {background:red;top:50px;}
#second {background:blue;top:150px}
JavaScript
var x=10;
window.setInterval(function(){
x=(x+2)%120;
first.style.left=x+"px";
},10)
var y=10;
window.setInterval(function(){
y=(y+1)%100;
second.style.left=y+"px";
},10)