Answer 1

Try using link tag to link your css and js file to your html file.

Answer 2

Mofey if your css and js don't apply in your html code try providing a link to them using

<link rel='stylesheet' href='style.css'></link>

<script src='active.js'></script>

Answer 3

The problem is with your connection between the HTML file and the CSS and JS files. Nothing is wrong with the compiler