Most theme plugins ask too much from the start. If you know how to create a simple page with default Tailwind, you already know how to use this theme plugin.

🧪 See it live

🧱 See examples

npm install tailwindcss-multi-theme

In tailwind.config.js add themeVariants to the theme property, with the value(s) of your theme(s), and require the plugin. That's it.

module.exports = {
  theme: {
    themeVariants: ['dark']
  },
  variants: {
    // just add dark to any variant that you want to style
  },
  plugins: [require('tailwindcss-multi-theme')],
}

It will create a set of classes based on your variants and expect a class .theme-<the name of your themeVariants> at the top of your HTML document.

themeVariants: ['dark'] would activate its classes under .theme-dark.

👉 themeVariants is the only configuration option.

It expects an array of strings, so there is no limit to how many themes you can create. Want a dark and a neon theme (you don't need to specify your default)? Do this:

module.exports = {
  theme: {
    themeVariants: ['dark', 'neon']
  },
  variants: {
    // just add dark and neon to any variant that you want to style
  },
  plugins: [require('tailwindcss-multi-theme')],
}

You can now place the class .theme-dark or .theme-neon at the top of your HTML (eg. on body or an enclosing div) and just write classes like:

dark:bg-gray-900 dark:text-gray-300

But just this won't work. You need to specify what variants of your theme you want, in your variants:

...
variants: {
  backgroundColor: ['responsive', 'hover', 'focus', 'dark'],
  textColor: ['responsive', 'hover', 'focus', 'dark'],
},
...

What if you need to style the hover, focus or any other variant on some specific theme?

...
variants: {
  backgroundColor: ['responsive', 'hover', 'focus', 'dark', 'dark:hover', 'dark:focus'],
  textColor: ['responsive', 'hover', 'focus', 'dark', 'dark:hover', 'dark:focus'],
},
...

The same way you would write it in HTML (dark:hover:bg-red-100) you write in your variants settings, just by adding a : before the variant.

So, if you're already using focus-within, it would be called dark:focus-within, considering your theme is called dark.

If you're more into writing some CSS using @apply, you could try this:

input {
	@apply bg-gray-300;
}

input:focus {
	@apply bg-white;
}

/**
 * Place your theme styles inside .theme-<your-theme>
 * In this case, we have themeVariants: ['dark']
 */
.theme-dark {
	input {
		@apply bg-gray-800;
	}

	input:focus {
		@apply bg-gray-500;
	}
}

a.k.a prefers-color-scheme

You should use prefers-dark.js to detect if it is supported. If so, the theme will be applied automatically. Place it in the top of the head of your HTML (execute early to reduce the flash of light theme).

By the way, you can check one of the examples

If you're looking for a CSS only approach, you could give tailwindcss-theming a try.

I'll tell you the truth. I'm lazy. I created this plugin for people that, like me, just want to keep writing Tailwind CSS as always, with the same familiar syntax, no theme files, no extensive obligatory docs read to know how to color my backgrounds.

It just prepends your theme variable to the good old Tailwind classes.