User blog:DanteVin/Black Font on Thumbnail Captions?

One thing that I have observed on some pages is that the captions of thumbnail images would become invisible, as in black text font on a black background. Look at the image on Glyph System for example...

Any fellow admins know which part of the CSS controls the font style of thumbnail images? It would be nice if it is set to white line the article text.

Although, I have seen some thumbnail images with white text on some pages like Castlevania: Symphony of the Night. The thing is, it was "fixed" by using HTML p tags.