Adding padding/margin inside light box

http://dtdmedia.com/clients/Jil/JilGordon/illustration/portraits/

Hi – If you go to the page above and click on the 3rd photo from the left in the top row (“Zoe – Graphite and Pencil”), the image sits beneath the semi-transparent bars leaving a thick gray line on the top and the bottom of the picture. This the case w/several other images too. I tried adding:

.lg-image {margin-top:50px; margin-bottom:50px} – the top worked, the bottom didn’t change.

I basically need the upper and lower limits of the image to stop short of the transparent bars that run horizontally across the top and bottom of the light box.

Can you help (again)? Thanks!