OK, this is a table-based template, and the box id is different from standard as well. The template maker seems to have gone out of his way to counter a common characteristic of table use, that their parts are hard to address individually with a stylesheet, and put an id on absolutely everything whether it needs it or not. There is also a content div inside the content <td>, and a wrapper div inside that.
But all that aside, you should be able to control the list margin with
#bestsellersContent ol {margin-left: .3em;}
If that doesn't work, try
#bestsellersContent ol {margin-left: .3em !important;}
The !important is somewhat of a copout, but if it works, you know there is a style overriding this and you need to go hunting for it.



