Moving the Add to Cart, Size and Quantity box in Squarspace store

Site URL: https://www.rimzee.com/store/p/grindingishard

Hello all

I wanted to ask if possible, can someone help with moving the following buttons in to the position below?  Apologies for the poor illustration, hopefully it gets the point across!

It tends to fall out of place on Mobile view, anyway we can fix it so that it maintains position on both platforms?

Thanks

N

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