<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<body>
<h1>My First Heading</h1>
	<div class="some-block">
		<p>My first paragraph.</p>
	</div>
	<button onClick="alert('Thank you for clicking')" >Click me!</button>
</body>
</html>
body{
 background:#E0F7FA;
}
h1{
  color:#64B5F6;
}
div.some-block {
  background: #F3E5F5;
	padding: 5px 10px;
}
div.some-block p{
  color: #CE93D8;
}

External CSS

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External JavaScript

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