Fixed css linking problem 

Your problem is the CSS folder is called `CSS` but you were linking to it via `css/base.css` which works on a local computer but results in 404 (file not found) when you view on a web server. This is because CSS and css are different strings. Capitalization matters. Your local computer system typically lets this slide. 

Merge this pull request then hit the sync button within your GitHub for Windows app to pull changes local before you do any additional work.