AppleButtonMode

Black mode. According to branding guideline: "Use this style on white or light-color backgrounds that provide sufficient contrast; don’t use it on black or dark backgrounds"

White mode. According to branding guideline: "Use this style on dark backgrounds that provide sufficient contrast."

White with outline mode. According to branding guideline: "Use this style on white or light-color backgrounds that don’t provide sufficient contrast with the white button fill. Avoid using this style on a dark or saturated background, because the black outline can add visual clutter; instead, use the white style to contrast with a dark background."