Make collection grid size relative and conforms to display size - Venture

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Hi, I'm having trouble with collection grid images being cut off when on smaller mobile devices. 

My website is - - password - thunder

If you look at - - on a mobile device you can see that their  4 collection grid images adjust with how small you make the screen and in general they dont get cut off by the sides of the screen, they stay fixed at 100% width. 

Id like to achieve this with my collection grid. Thank you.