Add the THEME.SCSS code to the bottom of Theme.scss.liquid which is located under Assets folder: Add the Product-gri...
There is only one code that you have to find and replace. Please see the github for the code. Code-Shopify-Hover-on-...
HOW TO: STEP ONE: Go to Shopify online and go Edit code for Debut Theme under ACTIONS. STEP TWO: Open THEME.SCSS.LI...