Site width / Sidebar width

Hi all,

My site at Shelmo.co.uk I’m using a custom theme and for the life of me, can’t work out how to increase site width, especially the right sidebar width.

I’ve searched through the forums and seen few replies from similar problems and tried to work it out from there but to no avail.

I’ve looked through CSS stylesheet for container or anything that looks like it controls the sidebar but I’m sure I’m missing something probably very simple to the eyes that know what to do look for.

Any help would be much appreciated.