add style file to html code example
Example 1: how to link css to html
<link rel="stylesheet" href="PathToYourFile.css">
Example 2: how to style in html file
<p style="text-align: center; color: pink;">Hello World</p>
<link rel="stylesheet" href="PathToYourFile.css">
<p style="text-align: center; color: pink;">Hello World</p>