Changing the design of excerpts

Hey Guys I am using Catch Responsive on http://www.globegliders.ch I like the theme but i would like to change the appearance of post excerpts so that the featured image is on top and bigger instead of on the left side. Also it would be perfect if the title of the post would be on the picture, maybe with a light white background so one can read it. For this i am toying around with .excerpt-image-left but it doesn't seem to work out. Is there maybe te possibility to do this in catch responsive pro? The i would just buy it. otherwise it would be nice to get a little heads uo ho to include featured image and post title in the same div container without killing the responsive designt of the theme... regards Moritz