Wikipedia should function and look right in any web browser. However, depending on the layout of an individual page and the Wikipedia skin set in your User preferences, a page layout might be broken in your browser. If the problem occurs on a single page, edit the page to fix it yourself. If you cannot fix it, put a message on the Talk page for the page (a screenshot always helps!). If the problem occurs on all pages, try a different skin. Your browser might have some minor issues. These are listed at Wikipedia:Browser notes.