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Cant Make my Grids Responsive

Link bellow, I cant seem to make my Grids responsive on all three of my product pages (Honduras Premium Cigars, Oliva, Nicaragua Premium Cigars) . I am very uninformed so if you see weird uses of properties pls try not to cringe :smiley: All I want is to make them responsive and look nice I have a lot of more products to add so Hopefully one of you fine folk can teach me how to do this right.
Side note: Id also like to add a “Jump to” sticky menu on the side of the page but since I am using a grid one change to an ID changes them all and the menu becomes useless. Any Ideas? Thank you!

Here is my site Read-Only: