Hi friend, a user on Incomdia has posted a very interesting website where I found something I've always wanted to achieve... I couldn't find a way to contact them directly, so taking advantage of your boundless generosity, I'm asking you to take a look at this site:

https://www.stiac.it/

At the bottom of the page, you'll find a design mode selector: light/dark.

I haven't found any object that does this; it must be some customized code. Could you give me a hand in achieving something like this?

Thank you so much.
Regards