How to make font in add to cart button smaller and make the products screen fill the window?

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I'm currently working with the Debut theme and I noticed that when I added the app "Smart Product Filter", the entire products page shifted to the left leaving a blank space to the right and the add to cart words in the button shifted because the font is too big for the button. Any tips on how to fix this? It's been driving me nuts. I have very limited coding experience but I feel like this is an easy fix. Any tips help! Thank you.