document.getElementById('x1312').innerHTML = (new Array(400)).fill("0x1312").join(" "); const background = document.getElementById("background"); const logo = document.getElementById("logo").cloneNode(true); logo.id = ""; (new Array(Math.ceil(window.innerWidth / 100) * Math.ceil(window.innerHeight / 100))) .fill(null) .map(_ => logo.cloneNode(true)) .forEach(l => { background.appendChild(l); });