HTML elements can belong to more than one class.
To define multiple classes, separate the class names with a space, e.g. <div class="city main">. The element will be styled according to all the classes specified.
In the following example, the first <h2> element belongs to both the city class and also to the main class, and will get the CSS styles from both of the classes:
<!DOCTYPE html>
<html>
<head>
<title>Multiple Classes</title>
<style>
.school {background-color: tomato;color: white;padding: 10px;}
.main {text-align: center;}
</style>
</head>
<body>
<h2>The class Attribute</h2>
<p>Use CSS to style elements with the class name "school":</p>
<h2 class="school main">GSSS KHOKHAR</h2>
<p>GOVT.SEN.SEC.SCHOOL, KHOKHAR</p>
<h2 class="school">GHS HARAZ</h2>
<p>GOVT. HIGH SCHOOL, HARAZ</p>
<h2 class="school">GSSS SARAINAGA</h2>
<p>GOVT.SEN.SEC.SCHOOL, SARAINAGA</p>
</body>
</html>