I have a client with a square logo, and even if I set the checkout logo to use Logo size: Large, it's still really small and hard to read. I assume this is a height limitation, but they don't let you set the height. What am I supposed to do to fix this when Shopify won't give us access to checkout.scss anymore?
Currently, the checkout logo is limited to 3 sizes, or heights: small = 40px, medium = 60px and large = 80px.
There is a workaround you could try. You can create a background image that is mostly whitespace and shows the logo at the top as large as you want. You may have to play around to get the positioning the way you want but ultimately you will end up with a large logo at the top and a background color of your choosing. :)
All the best!
Please share your store URL and reference site URL.
So that I can check and let you know.