why do you use html in css code example

Example 1: CSS IN HTML

<!-- Styles can be inserted in html using <style></style> element -->
<style>
	body {
    	background-color: cyan/*Color*/; 
  	}
</style>

<!--CSS can also be linked using link tag in html 
-the link tag is a self-closing tag-->

<link rel="stylesheet" type="text/css" href="filename.css"/>

Example 2: style.css in html

put in the <header> tag:

<link rel="stylesheet" href="style.css">