Is there any way to alter the appearance of captions on gallery photos

I use gallery photos to display a selection of grouped products on my shop homepage. I need to add a description to each photo so that the customer knows what the category is. But the sqauerspace captions are very ugly, in a small font, not able to centre-justify them or change their colour or anything. Is there any wa round this without changing the font for my entire website. Is there any way to make hover captions on gallery photos which work as click-through URLS?

Can you share link to page where you use gallery? We can help easier.