This tutorial is based on the default.css. If you want to make a change do it to the user.css, it's an empty css which will 'overwrite' the default.css. So there's actually no need to fiddle with the default.css. In most parts I'll simply give the part which you can put in the user.css, so if you see .widgetcontent { color: #fff; } you can copy/paste that one into your user.css and change the colorcode to your liking. You can combine parts of course. If you see .widgetcontent { color: #fff; } and .widgetcontent { background: #fff; } you can combine it to .widgetcontent { color: #fff; background: #fff; }