I have made a custom theme (based on twenty eleven).
In this theme I also slightly customized the sidebar. It's working perfectly in all my normal pages, but in the 404 page my sidebar is displaying wrong.
It's in the right place, but the widgets in the sidebar somehow overlap (instead of the widgets being vertically aligned, they are now placed horizontally, which makes them overlap).
I've tried many things, but none seems to work.
I am a novice at making websites, so it could be it's very easy to someone else, but as I said, I can't find my mistake. I have learnt some basic HTML, PHP and CSS along the way, but obviously not enough.
I hope anyone can help me solve this problem, because I'm really stuck here.
The website is http://www.euro-match.com