Internal CSS
The internal stylesheet is used to apply unique styles to a single document.
It is defined within the <style> tag inside the <head> section of
the HTML page.
Example
<!DOCTYPE html>
<html>
<head>
<style>
body {
background-color: red;
}
h1 {
color: blue;
margin-left: 70px;
}
</style>
</head>
<body>
<h1>This heading has an internal stylesheet applied.</h1>
<p>This paragraph is not affected.</p>
</body>
</html>
Output
