ADDING INTERNAL CSS TO HTML DOCUMENT
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>HTML</title>

<!-- internal styles -->
<style>
  h2 {
     color: blue;
	 font-size: 22px;
  }
  p {
    text-align: left;
	color: red;
	font-size: 22px;
  }
  button {
     background: cyan;
	 padding: 10px;
	 margin: 3px;
  }
</style>
</head>
<body>
   <h2> Internal styles </h2>
   <p> We have added internal styles to our HTML document </p> 
   <button> Click Here </button>
</body>
</html>