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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Use CSS prefers-color-scheme when your interface should follow the device automatically. Add a root .dark class or data-theme="dark" attribute when users need a manual choice, and resolve that choice before theme-dependent UI renders. In the App Router, the key is coordinating the selector, persistence, server-rendered HTML, and client hydration rather than simply inverting a few colors.
Choose the theme model first
Your requirements determine the implementation:
| Requirement | Recommended pattern | What it implies |
|---|---|---|
| Only follow the operating-system setting | CSS @media (prefers-color-scheme: dark) |
No theme state or toggle is needed. |
| Let a user force light or dark | Root class or data attribute | Store the explicit choice and update the root selector. |
| Offer Light, Dark, and System | Three-way selector with a system fallback | “System” must track changes to the OS preference. |
| Theme-dependent controls in server-rendered markup | Resolve the theme before rendering, or hide the control until mounted | Prevents hydration mismatches. |
The App Router is file-system based and uses React Server Components, Suspense, and Server Functions. That means your layout can be a Server Component while a provider and toggle run on the client.
System-preference-only dark mode with CSS
When no manual override is required, keep the solution entirely in CSS. This avoids client-side state just to change colors.
:root {
color-scheme: light;
--background: #ffffff;
--foreground: #171717;
--muted: #5f6368;
}
@media (prefers-color-scheme: dark) {
:root {
color-scheme: dark;
--background: #0b0d10;
--foreground: #f5f7fa;
--muted: #aab2bd;
}
}
html, body {
background: var(--background);
color: var(--foreground);
}
.muted { color: var(--muted); }Import this stylesheet from app/layout.tsx (for example, through app/globals.css). Use semantic variables rather than scattering literal colors through components. The color-scheme property also lets browser controls such as form fields and scrollbars use an appropriate palette.
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Theme-specific images without JavaScript
If an illustration differs between themes, use a picture element:
<picture>
<source media="(prefers-color-scheme: dark)" srcSet="/hero-dark.webp" />
<img src="/hero-light.webp" alt="Product dashboard" />
</picture>For Next.js Image components, a CSS media-query approach can show two variants. Lazy loading normally fetches only the visible variant; making both variants eager can fetch both files. For a high-priority image, set the appropriate fetchPriority rather than eagerly loading every theme asset.
Manual light/dark mode with a root selector
A manual theme needs one authoritative selector near the document root. A class is conventional:
/* globals.css */
:root { --background: #fff; --foreground: #171717; }
.dark { --background: #0b0d10; --foreground: #f5f7fa; }
body { background: var(--background); color: var(--foreground); }Or use an attribute, which is useful when you want selectors such as [data-theme="dark"]:
[data-theme="light"] { --background: #fff; --foreground: #171717; }
[data-theme="dark"] { --background: #0b0d10; --foreground: #f5f7fa; }Put the selector on <html>, not on an arbitrary page wrapper, so portals, dialogs, and the entire viewport inherit the same theme.
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Tailwind CSS selector mode
Tailwind’s dark utilities follow prefers-color-scheme by default. For a manual mode, configure the dark variant to respond to your root selector (for example, .dark or [data-theme=dark]), then use classes such as bg-white dark:bg-slate-950. Keep the selector convention consistent with your JavaScript; mixing a class-based configuration with an attribute-based script leaves utilities stuck in one mode.
App Router implementation with next-themes
next-themes supplies a provider, persistence, system-mode handling, and root-attribute updates. Create a client component:
// app/theme-provider.tsx
'use client'
import { ThemeProvider } from 'next-themes'
import type { ReactNode } from 'react'
export function AppThemeProvider({ children }: { children: ReactNode }) {
return (
<ThemeProvider
attribute="class"
defaultTheme="system"
enableSystem
disableTransitionOnChange
>
{children}
</ThemeProvider>
)
}Wrap your application below the root document tags:
// app/layout.tsx
import './globals.css'
import { AppThemeProvider } from './theme-provider'
export default function RootLayout({ children }: Readonly<{ children: React.ReactNode }>) {
return (
<html lang="en" suppressHydrationWarning>
<body>
<AppThemeProvider>{children}</AppThemeProvider>
</body>
</html>
)
}The provider modifies the html element, so suppressHydrationWarning belongs there. It suppresses the expected attribute difference; it does not repair arbitrary mismatches elsewhere.
Hydration-safe toggle
The current theme is unavailable during the server render. Do not render a theme-dependent button label until the component has mounted:
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// app/theme-toggle.tsx
'use client'
import { useEffect, useState } from 'react'
import { useTheme } from 'next-themes'
export function ThemeToggle() {
const [mounted, setMounted] = useState(false)
const { theme, setTheme, resolvedTheme } = useTheme()
useEffect(() => setMounted(true), [])
if (!mounted) {
return <button type="button" aria-label="Choose theme" disabled>Theme</button>
}
const effective = theme === 'system' ? resolvedTheme : theme
return (
<button
type="button"
onClick={() => setTheme(effective === 'dark' ? 'light' : 'dark')}
aria-label={`Switch to ${effective === 'dark' ? 'light' : 'dark'} mode`}
>
{effective === 'dark' ? 'Use light mode' : 'Use dark mode'}
</button>
)
}For a three-way control, expose three values and call setTheme('light'), setTheme('dark'), or setTheme('system'). “System” should remain a real stored choice, not a one-time conversion to the current color, so later operating-system changes are honored.
Handling the first visit and persistence
On an initial visit with no saved choice, a system-based setup should read prefers-color-scheme. A provider can do this in the browser and persist the user’s explicit selection (commonly in local storage). The server cannot read that browser preference unless you introduce a separate cookie or other request signal, so avoid rendering different text or icons on the server based on an unknown theme.
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- Use neutral, theme-independent markup for the initial server render.
- Apply the root selector as early as possible to reduce a flash of the wrong colors.
- Delay labels, icons, and menus that depend on the resolved theme until mount.
- Test a fresh profile, a previously saved choice, and an operating-system switch while “System” is selected.
Theme-specific images with Next.js
Use CSS media queries or picture when the asset should follow the system. If the image follows a manual class or attribute, render both variants and hide one with CSS, or choose the asset in a mounted client component. Consider bandwidth: two eager Image components can download both files, while lazy loading ordinarily limits the request to the visible variant. Set fetchPriority for the single above-the-fold asset that genuinely needs priority.
CSS-in-JS in the App Router
CSS-in-JS can work with dark mode, but the library must support Server Components and streaming. Follow its App Router integration pattern: create a style registry, collect styles with useServerInsertedHTML, and place the registry in a Client Component wrapper. Ensure the generated theme selector is present consistently in server and client output; otherwise streaming can expose unstyled content or hydration warnings. If your library lacks documented support for these React features, plain CSS variables or a supported utility framework is the safer path.
Common failures and fixes
Flash of light theme
Cause: the dark selector is added only after hydration. Fix: use a provider that applies the attribute early, keep the initial markup neutral, and avoid client code that waits several seconds before setting the theme.
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Hydration mismatch warning
Cause: a server render reads theme, resolvedTheme, or browser storage before those values exist. Fix: gate the dependent UI behind a mounted flag and put suppressHydrationWarning on the html element when a provider changes it.
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Cause: Tailwind is still configured for system media queries while your script sets a class or attribute. Fix: switch the dark variant to the exact selector your script writes and verify that it is on html.
System mode stops following OS changes
Cause: “system” was converted to a fixed light/dark value. Fix: retain system as the selected mode and let the provider or a matchMedia listener resolve it whenever the preference changes.
Both image variants download
Cause: both images were marked eager or high priority. Fix: allow lazy loading for noncritical variants and assign priority only to the asset that is visible and above the fold.
Styles disappear during streaming
Cause: a CSS-in-JS registry is not inserted with the App Router’s streaming lifecycle. Fix: use the library’s documented style registry and useServerInsertedHTML integration, and confirm the library supports current React Server Component behavior.
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Testing checklist
- Fresh browser profile with OS light and dark preferences.
- Saved light, dark, and system choices across a full reload and a second route.
- OS preference changed while the app remains open in system mode.
- JavaScript disabled or delayed, checking that base colors remain usable.
- Keyboard focus, form controls, dialogs, charts, code blocks, and images in both palettes.
- Slow network, streaming navigation, and production builds rather than only development mode.
Or skip the browser setup
If your goal is a clean screenshot of a themed page rather than implementing the theme, ScreenshotNeo returns PNG, JPEG, WebP, or PDF from one request. It accepts consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be disabled. Bot checks, CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing result. Its MCP server gives Claude, Cursor, and other MCP clients take_screenshot, get_page_info, and capture_pdf tools.
cURL
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);See the complete parameter reference in the ScreenshotNeo documentation. Options include full-page capture with lazy images loaded, CSS-selector element capture, dark mode, 12 device presets or custom viewports, retina scale, PDF paper settings and page ranges, custom CSS and JavaScript, clicks, selector or network-idle waits, request blocking, headers, cookies, user agents, authorization, timezone, geolocation, transparent backgrounds, resizing, chosen cache TTLs, signed image links, asynchronous webhooks, bulk capture of up to 100 URLs per call, usage data, and an OpenAPI specification. Existing parameter names from other screenshot APIs are accepted to ease migration.
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Frequently Asked Questions
Can a Server Component read the user’s dark-mode preference?
Not directly from the browser’s media-query preference. Use neutral server markup and resolve the preference in the client, or pass an explicitly stored cookie when your architecture requires server-side variation.
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Either works. Choose the selector your CSS or Tailwind configuration supports, apply it to the root html element, and use the same convention everywhere.
Is a dark-mode toggle required for accessibility?
No single toggle is mandatory, but maintain readable contrast, visible focus indicators, and usable controls in both palettes. Respecting the system preference is a good default.
Quick Recap
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