How to properly embed a Shopify cart on a website?

Question

Online shopping

Has anyone experienced inserting Shopify products and carts into a third party site?
With the goods it is more or less clear, but with the basket it turns out crooked. I generate an embed code and place it on a test page.
When checking, I see the cart button, but its popup pops up somewhere at the top. Apparently there are jambs with css, but I did not find any settings for fixing in the documentation, it seems that their script itself prescribes css indents and so on.
How to deal with this?