Take away border around my images

Which images are you referring to?

If you are referring to the images on the homepage with the light grey border.

Add this code to your css file.

ul.products li.product img {border: 0;}

Can you tell me where I find my css file?
I am referring to the images on the front page https://www.fitnessandkids.com

Ok I think I found the css. but now I need to get rid of the box around the images that are on my products pages. ex.
https://fitnessandkids.com/product/razor-e100-electric-scooter/