Ygo Loner theme: meaning of acch_div, and .box

The theme viewer seems to have not introduced any new themes since December, which is a pity for those of us looking for new themes.

Anyway, I’m trying to hack an old theme called Ygo Loner, here: https://donnabarstow.com/cartoon_blog/. I’m very slow, and I’m driving myself crazy. I printed out the whole css to try to understand what affects what in the theme.

The author is no longer around. There are two entries in the css that I can’t find here or on google: content.acch_div – I have no idea what this means, or what part of the page it affects! – and a .box. I can see that .box2 is the box under the content that shows how many comments there are, but can’t find the first box.

Any help would be most welcome.