Main Woocommerce Shop Page (Product Categories)

Hello, I use your nice theme. For Woocommerce, my main product catalog page is my product category page. For the moment I have three categories of products, but my three images are displayed in a row, glued against each other. They are grouped together and form a single image. I would like my product category images to display distinctly, at the same dimensions as the blog images. How to do please? Thank you.

The page I need help with: [log in to see the link]