How to use Drop-Down Setting correctly?

Hi folks, I want to add an option to my style to support setting the default font or apple font. Something like:

Default:
span, p, a, textarea, #footer, strong, input, li{
font-family: not spectical;
}

Apple font:
span, p, a, textarea, #footer, strong, input, li{
font-family: -apple-system, BlinkMacSystemFont !important;
}

But i do it on userstyle editor, it not worked, screenshot here: https://i.imgur.com/Y9vS7rY.png

What should I do? Thanks.

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