CSS CHANGES

Hi i just updated my main theme, while having a child theme already active, but the update seems to have caused a few small things to change. Would it be possible to have some help with CSS to make these changes?

cart page - http://tinyurl.com/pxueby8
Screenshot of changes - http://www.tiikoni.com/tis/view/?id=1093532
and on final checkout page - http://www.tiikoni.com/tis/view/?id=cde7950
1) Scale thumbnail by 3 x
2) Change background of purple buttons to black

Support Access is open

Please dont post any brand related information/ screenshots or domain links as i have had issues with google caching this information and linking it to their google searches of my site ... very bad for brand... please use temporary image upload / tiny url / pastebin etc to mask this information.

Thanks

Tom