Changing Text Box Colour?

[Mousenheath]

My forum has a very dark theme, and I rather like it like that, but for best visibility I have white text. There is, however, one problem with this and that is that when you start to type a message the bit you type your message in to (sorry, I don't know the names of these things XD) is also white and you can only see your text when you highlight it. On my previous forum, the text box-thingmajic was green so I'm assuming it can be changed. ^^ Can anyone tell me how?

EDIT: Worked it out myself. ^^ Marking this topic as solved. Please lock.