JSFiddle - React, Tailwind, and code Playground

HTML

<div id="myDiv"  onload="move();">
<img src="image.png" id="anImage" >
</div>

CSS

#myDiv
{
    position:absolute;
    bottom:40%;
    left:100px;
    border: 3px solid black;
}

JavaScript

var block= null;

function init() {
  block= document.getElementById('myDiv');
  move();
}

function move() {   
  block.style.left =  parseInt(block.offsetLeft, 10) + 10 + 'px';

  if(parseInt(block.offsetLeft, 10)>=600) {
    block.style.left = '12px';
  }

  setTimeout(move,20);
}

window.onload = init;