Remix

Adding dark mode to your remix app.

Modify your tailwind.css file

Add :root[class~="dark"] to your tailwind.css file. This will allow you to use the dark class on your html element to apply dark mode styles.

app/tailwind.css

Astro Introduction

On This Page

Modify your tailwind.css file Install remix-themes Create a session storage and theme session resolver Set up Remix Themes Add an action route Add a mode toggle

Deploy your shadcn/ui app on Vercel

Trusted by OpenAI, Sonos, Adobe, and more.

Vercel provides tools and infrastructure to deploy apps and features at scale.


pnpm add remix-themes

app/sessions.server.tsx

import { createThemeSessionResolver } from "remix-themes"
 
// You can default to 'development' if process.env.NODE_ENV is not set
const isProduction = process.env.NODE_ENV === "production"
 
const sessionStorage = createCookieSessionStorage({
  cookie: {
    name: "theme",
    path: "/",
    httpOnly: true,
    sameSite: "lax",
    secrets: ["s3cr3t"],
    // Set domain and secure only if in production
    ...(isProduction
      ? { domain: "your-production-domain.com", secure: true }
      : {}),
  },
})
 
export const themeSessionResolver = createThemeSessionResolver(sessionStorage)

app/root.tsx

import clsx from "clsx"
import { PreventFlashOnWrongTheme, ThemeProvider, useTheme } from "remix-themes"
 
import { themeSessionResolver } from "./sessions.server"
 
// Return the theme from the session storage using the loader
export async function loader({ request }: LoaderFunctionArgs) {
  const { getTheme } = await themeSessionResolver(request)
  return {
    theme: getTheme(),

Create a file in /routes/action.set-theme.ts. Ensure that you pass the filename to the ThemeProvider component. This route it's used to store the preferred theme in the session storage when the user changes it.

app/routes/action.set-theme.ts

import { createThemeAction } from "remix-themes"
 
import { themeSessionResolver } from "./sessions.server"
 
export const action = createThemeAction(themeSessionResolver)

components/mode-toggle.tsx

import { Moon, Sun } from "lucide-react"
import { Theme, useTheme } from "remix-themes"
 
import { Button } from "./ui/button"
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "./ui/dropdown-menu"
 
export function ModeToggle() {
  const [, setTheme] = useTheme()
 
  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="ghost" size="icon">
          <Sun className="h-[1.2rem] w-[1.2rem] scale-100 rotate-0 transition-all dark:scale-0 dark:-rotate-90" />
          <Moon className="absolute h-[1.2rem] w-[1.2rem] scale-0 rotate-90 transition-all dark:scale-100 dark:rotate-0" />
          <span className="sr-only">Toggle theme</span>
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end">
        <DropdownMenuItem onClick={() => setTheme(Theme.LIGHT)}>
          Light
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setTheme(Theme.DARK)}>
          Dark
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  )
}