Buttons - Sign in with Apple - Human Interface Guidelines
https://developer.apple.com/design/human-interface-guidelines/sign-in-with-apple/overview/buttons/
In iOS, macOS, and the web, you can change the corner radius to produce a button with square corners or a pill-shaped button. For developer guidance, see cornerRadius (iOS and macOS) and Displaying and Configuring Sign in with Apple Buttons (web). Maintain the minimum button size and margin around the button in iOS, macOS, and the web.
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