Features
You can customize the look and feel of the checkout by going into the button frame and selection the overlay. That overlay has the Lemon Squeezy embed and a top bar with a close button. If you find and select the embed component inside the overlay, you can change the link to your Lemon Squeezy checkout link. The interaction works perfectly fine if you copy it to your project and start using it without any modifications (other than the checkout link change).

Step / 01
Remix the project.

Step / 02
Copy the button element.

Step / 03
Paste it into your project.

Step / 04
Select the button > then the overlay in it.

Step / 05
Find the embed component and change the URL.