One of the most common CSS questions is undoubtedly how to center an element vertically. There are several techniques for doing that, but many, including one that I posted more than seven years ago in Centering with CSS, rely on specifying a height for the centered content. That obviously makes the technique somewhat inflexible.
I recently needed to center something both horizontally and vertically and started thinking that there might be better ways of doing it if I could disregard IE7 and older. The technique I ended up with uses display:table to center the whole page and seems to work well, though there is one caveat.
Posted in Accessibility, CSS.