use js to change css code example
Example 1: add style javascript
element.setAttribute("style", "background-color: red;");
element.style.backgroundColor = "red";
Example 2: javascript modify css
var el = document.getElementById("elementID");
el.style.css-property = "cssattribute";
el.style.backgroundColor = "blue";
$("#elementID").css("css-property", "css-attribute");
$("#elementID").css("background-color", "blue");
$("#elementID").css({"css-property": "css-attribute", "css-property": "css-attribute"});
$("#elementID").css({
"css-property": "css-attribute",
"css-property": "css-attribute"});
Example 3: how to change style of an element using javascript
<html>
<body>
<p id="p2">Hello World!</p>
<script>
document.getElementById("p2").style.color = "blue";
</script>
<p>The paragraph above was changed by a script.</p>
</body>
</html>