change css javascript by class code example

Example: jQuery - Get and Set CSS Classes

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("h1, h2, p").addClass("blue");
    $("div").addClass("important");
  });
});
</script>
<style>
.important {
  font-weight: bold;
  font-size: xx-large;
}

.blue {
  color: blue;
}
</style>
</head>
<body>

<h1>Heading 1</h1>
<h2>Heading 2</h2>

<p>This is a paragraph.</p>
<p>This is another paragraph.</p>

<div>This is some important text!</div><br>

<button>Add classes to elements</button>

</body>
</html>

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Css Example

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