My question is: is there a effective method for finding this problem?
The website under developement is currently online at http://rd.gip2012.be so you can see what the problem is.
I checked the .css file. I commented everything unnecessary out but it still doesn't fix the layout. My guess is its not in the .css file after all. but to be sure, i'll post the code here. Maybe i overlooked something.
I would appreciate it if you could take the time to read it.
I solved the problem. I checked the website with the "web developer" plugin for Firefox. There, it seemed that the css file simply didn't came trough. I checked the reference in the index file and found out that the type property was wrong. I used
So if someone has similar issues, it might be good to check that out.