[SOLVED] How to change to fixed width

Hi,

This is probably a beginners question, but I would like to change the layout to a fixed width or at least set width of the center column. Now I have been searching through the settings but couldn't find anything for this, not even a good place to put any css. I tried e.g. Center Column->Style & edit CC->Center column style and width:600px but that didn't have any effect.

My guess is that I am both rusty in my webdesign skills and totally missing something, but it would be great if anybody could advice me.

Thanks,

Ciao,

Ben