CSS changes - Main page slider making image fit the full area available?

Hi,
I have an issue with the slider on my site, when uploading the image, they are stuck on the right-hand side and don't seem to be either centered or filling the slider area?
not sure if this is an issue with CSS/ Theme or just my file is too small or something else?

changes - http://www.tiikoni.com/tis/view/?id=f1502e3
Domain: http://tinyurl.com/pj5agg6
Support access is ACTIVE until July 17, 2015 8:33 pm

Thanks

Tom