overlay post title on featured image?

hi,

i have 3 featured post widgets on the home page of this site i’m building –

http://influencer.dylanmcleod.net.au

i want the post titles to appear on top of the featured post images but can’t figure out which css to modify. any ideas?

something similar to this – http://css-tricks.com/text-blocks-over-image/

i’m using genesis featured post widget and genesis framework/child theme.

thanks in advance!