Dark mode is not working

[MyDataHouse]

tailwindcss Version 4.1.8
The installation and configuration were done according to the official Vite example. hover: and other styles work, but dark: has no effect

[wongjn]

It seems like you're trying to use a dark class name to toggle between dark and light mode. By default, Tailwind uses the prefers-color-scheme media query. So, to use a class name toggle instead, you'd need to configure Tailwind to do so:

 @import "tailwindcss";

+@custom-variant dark (&:where(.dark, .dark *));

[MyDataHouse]

Thank u