Hi. I want to do customization on checkout. I’m on Shopify plus and still, i’m not able to add some CSS.
I created checkout.scss, checkout.scss.liquid and checkout.css. when i try to modify breadcrumbs it shows nothing. It would be great if Shopify support staff can contact me. It’s urgent.
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Welcome to the Shopify community!
Thanks for your good question.
Please share your store URL.
So that I will check and let you know the exact solution here.
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Go through this url.
Sorry you are facing this issue, it would be my pleasure to help you.
Welcome to the Shopify community! 
Thanks for your good question.
Please share your site URL,
I will check out the issue and provide you a solution here.
Those css files are not automatically included like they used to be many moons ago. There’s good reasons for that.
If you want a custom CSS file to be loaded in your checkout file, just add the link element () to bring it in.
So now you have to add all the script and css in the checkout.liquid file. You don’t need to create another file for css or script.