Attchment Box Background Color (vB 4.2.1)

[MacroPhotoPro]

I have a custom forum color that I really like, and am tinkering with the colors before opening my site to the public. However, I noticed when downloading an attachment that (once loaded) the background to the attachment is still white. I have gone into my StyleVar and tinkered with the "Attachment" choices, and it has no effect on the produced outcome. Here is what I mean:

I am trying to modify the font color that says, "Attached Thumbnails," as well as the white background color to a darker color, so it's not such an eyesore as it is now.

Could anyone help me locate where I can make these adjustments?

Thank you very much,

Jack