Quantity-Pricing not Centered

Site URL: https://mackerel-collie-9dwr.squarespace.com/config/design/custom-css

Trying to fix the quantity, price. Everything is off to the left and not centered and I cannot center it at all no matter how I try. Also, the Add to Cart button is so long. Is there a way to fix this. 

Hi,
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Best,
Leopold