var div = document.getElementById('myElementID');
div.innerHTML += "Here is some more data appended";
var div = document.getElementsByClassName('bottom-footer');
div[0].innerHTML += '<div> <span> © Copyright 2021 <a href="http://softskills.anohadigital.com/">SOFT-SKILLS</a>. Tous droits réservés. </span> </div>';
var div = document.getElementById('myElementID');
div.innerHTML += "Here is some more data appended";