How to add CSS properties to an element dynamically using jQuery


Use the jQuery css() method

You can use the jQuery css() method to add new CSS properties to an element or modify the existing properties values dynamically using jQuery.

Let's try out the following example to understand how this method basically works:

<!DOCTYPE html>
<html lang="en">
<title>jQuery Add CSS Property Dynamically</title>
<script src=""></script>
        $("h1").css("color", "red");
            "background-color": "yellowgreen",
            "font-weight": "bold"
    <h1>This is a heading</h1>
    <p>This is a paragraph.</p>