RPG Character sheet issue (beside posts)

three elements to the sheet, Name, Age, and Description. The name and age are text, and the description is a text/list. The problem is that the text/list element is displayed within a small frame (with a scroll bar) that has a white background. This is a problem because the rest of the forum has a dark background... so the text doesn't read well within the white frame.

Is there a way of changing the color of the text/list element's background so that it matches the rest of the forum? I looked in all the "appearance and colors" section, and there is no option that is set to white...