Selection of button (idk what its called someone give me a better title)

[jovial rapids]

So how do you disable this thing?
https://github.com/alvinsjoy/PortfolioWebsite

[weary talon]

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[jovial rapids]

for example check: https://ui.shadcn.com/
theres a similar theme button, if you try to change the theme, the button is not kept selected after the theme change
but in my case: https://www.alvinjoy.live/
after theme change, button is still selected

this is what should be happening:

[wet wind]

outline 0 @jovial rapids

like set outline to be 0

[jovial rapids]

it worked thanks