CSS Editor Help

Hi everyone and thanks for looking, any help will be greatly appreciated!

I am currently building this website for my buisness http://www.cardiofitness.co.uk and on the online shop I am wondering if there is any way that I can get rid of the solid black lines around the products on the main display page?

Once you click through to the product http://www.cardiofitness.co.uk/running/products/mens-new-balance-1080/ is there anyway that I can get rid of the comments are closed boxes at the bottom?

and finally under the main picture and text next to the add to cart http://www.cardiofitness.co.uk/running/products/mens-new-balance-1080/ there is a second picture and some un needed scroll bars etc is there anyway i can get rid of this?

I hear i should be looking for certain codes to be entered in the css editor?

Once again any help will be really appreciated!

Joe