So I've been using the style sheet in the header as I was making my website, and now I want to move them in to a .css file and link to them. The problem is, that certain style elements become inactive and I don't know why. This line: body { background-image: url(http://www.MYSITE.com/files/img/nebula-background.jpg); } Code (markup): Wont work (even though the link is absolute and works fine when in the header) when I link to it. And on a different page: #container { width: 760px; width: 780px; width: 600px; border: 1px solid gray; margin-left: auto; margin-right: auto; margin-top: 10px; margin-bottom: 10px; padding: 5px; } Code (markup): doesn't work. Again, both these work fine in the header, but when I copy and paste them in to a .css file these two seem to stop working, while everything else is just fine. Anyone know what I'm doing wrong? Thanks