I have a wide gap between my attribute drop downs. I want to close this gap. Please see example here: http://www.collars2switch.com/animal...with-paws-p-13

Located in between the two attribute drop downs of: Collar Swatch Size and Swatch Width

How can I close this gap? Which file would I edit? It is big right now like a gaping hole and I want them one on top of the other if possible.