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To make an interactive selection of what the customer wants

My goal here is to make a page with :
On the one side buttons, on which you click to reveal or hide images
In the middle I want my product, with different images that are shown or hidden by the press of buttons. This requires stacking and i am having trouble with the positioning tool to make it responsive. I try to make it so that they have relative positions but then its just out of shape on different devices.
Finally in bonus, I want a number to increase or decrease depending on the buttons used, but this is a plus.

Thank you for any help you might bring

Here is my site Read-Only: LINK
(how to share your site Read-Only link)