My morning cup of Java hasn’t kicked in yet, but it looks like your HTML and CSS files weren’t linked correctly.
Filenames are case-sensitive. The compiler can’t find “Resources” folder because it doesn’t exist in the server, but it will find “resources”. Same goes for the subfolder “CSS”, which should be “css”. It’s a developer’s version of a 404 Error (“file not found”).
The link attribute’s also missing type=“text/css”, which finishes the two-way street necessary for your HTML and CSS to communicate properly. The whole snippet should look like this (don’t forget to add the required < > brackets):
link href="./resources/css/index.css" type=“text/css” rel="stylesheet"
Other than that, it looks good to me. You’ve got the basics down, now it’s just a matter of developing good W3C coding habits – and that simply takes a bit of practice.