Add another class to a div

Question

I have a function that checks the age of a form submission and then returns new content in a div depending on their age. Right now I am just using getElementById to replace

Answer 1

I use below function to animate UiKit gear icon using Just JavaScript

document.getElementById("spin_it").onmouseover=function(e){
var el = document.getElementById("spin_it");
var Classes = el.className;
var NewClass = Classes+" uk-icon-spin";
el.className = NewClass;
console.log(e);
}

This code not work here...you must add UIKit Style to it