That's a Bummer

I want to change Bela's Handstand's background colour, but it turns out that the rounded corners you see on all the boxes here come from a .gif file that is layed on top of the box. For an example, click here. The .gif file is stored on another computer, and the colour of those little corners is, of course, set to match the original background colour of the blog template, known as Rounders. Thus the illusion that the boxes have rounded corners is complete only if the background colour never changes. So I either have the usual background colour or square boxes. Oh well.

Haven't they come up with a transparent colour yet?