I've started using the Omega theme, and wanted to apply a vertical gap in between my blocks in the sidebar on the right called sidebar-second. I went into the themes settings, and added an additioanl css in "Additional region classes" but its applied it the whole of the sidebar, and I still have no gaps. I have tried inspecting in firebug, and if I amend 'region-inner' it works but applies to all regions including main content etc. I just wanted the ones in the Sidebar Second. I'm afraid I dont know enough css to - can someone point me in the right direction?