Lightbox -> Description too long

Website: http://www.pieroherrera.com/?page_id=199

Click on System Design: Analyzing data

AS you see, the description text is too long so it leaves the description area, I would like the area to adjust to the text and at the same time no overlap the image too much if possible.

Or even something like showing the description on the side of the image would be good as well.

I am using customizr theme and Lightbox Plus Colorbox plugin.

THANKS! and please any help is good.