added css from js code example
Example 1: add css in javascript
document.getElementById("demo").style.display = "none";
Example 2: add css style sheet with javascript
<head>
<script>
function myFunction() {
var x = document.createElement("LINK");
x.setAttribute("rel", "stylesheet");
x.setAttribute("type", "text/css");
x.setAttribute("href", "styles.css");
document.head.appendChild(x);
}
myFunction()
</script>
</head>