Shop flow custom font replacements

Site URL: https://iainsmith.photography/

Hi there,

I'm getting frustrated that there are lots of buried font areas which don't inherit the custom font changes I've made through most of the rest of my site. I'd like it to be consistent throughout but there are lots of small page elements where my changes haven't taken effect.

Could somebody point me to the elements I need to change in CSS to replace with my custom for for:

• Page error text (i.e. page not found)
• You have nothing left in your cart
• The numerical value above my cart icon (showing how many items are in my cart)
• The shopping cart page headers (item, quantity, price)
• Shopping cart page item description
• Shopping cart page quantity field value
• Total and subtotal text

Finally, how can I customise the actual text in the checkout button?

Many thanks in advance!

Iain