Customise Shopify Elements like the Cart or the Button Font

Hi,

I am just working on a Shopify-Webflow site.

zirbe.wenflow.io
https://preview.webflow.com/preview/zirbe?preview=c05c13e9d1235f0882f12daae2e6c6bc

How can I customise Shopify Elements like the Cart or the Button Font?