CSS
CSS stands for Cascading Style Sheets.
It is a simple mechanism for adding style (e.g., fonts, colours, spacing) to web pages.
<!DOCTYPE html>
<html>
<head>
<style>
h1 {
color: blue;
}
p {
font-size: 18px;
}
</style>
</head>
<body>
<h1>My CSS heading</h1>
<p>This is a paragraph.</p>
</body>
</html>