How to add css files inside html in webpage in website modules

Hi, As I’m trying to add css in webpage in website module. Here I’m Sharing images. In the left corner in attachments I attched all the CSS files and inside the html file I also give the path of css file. But it is not reflecting to the browser. Can anyone please help me.

Thanks in advance

Can any one please help me out. How to load multiple lines of css in webpage.