If you would like to remove (or enable) the dotted borders on the product grid and category grid pages, here's what you need to do:
- Log in to your CoreCommerce admin panel
- Hover over the Design tab and click Fonts, Borders and Colors
- In the left menu, click on Borders
- Here you'll see two options: Hide Border Around Categories and Hide Border Around Products
- Switch them to NO and then click Save at the top right.