Lulu here from the Shopify Support team. Thanks for reaching out here, and I'll be more than happy to help you out.
There isn’t actually the ability to edit the code for the checkout unless you are on the Shopify Plus plan. The primary reasons behind not being able to edit the checkout CSS are around security, responsiveness, and maintaining PCI compliance. If we had customized checkouts, any updates or improvements that we wanted to make would have to be made on a store-by-store basis. As you can imagine, this would take a very long time! It would also make the customer suffer if the checkout was then glitchy/not updated correctly.
We still allow you to customize your checkout style (as noted in this guide), such as changing the colours and adding a banner to the top of the checkout page. However, ultimately these systems are in place with the primary focus of making our platform more secure for you and your customers. We hope you understand that it’s with your best interest at heart.
I hope this helps but if you have any other questions, please let me know. Don't forget, Black Friday and Cyber Monday are just around the corner. We have put together this Black Friday Checklist for you. It is full of tips and tricks to make the most of the busiest online season so be sure to check it out!
Lulu | Social Care @ Shopify
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