Dark theme

All mantine components support dark color scheme natively without any additional steps. To use dark color scheme wrap your application in MantineProvider and specify colorScheme:

import { MantineProvider } from '@mantine/core';

function Demo() {
  return (
    <MantineProvider theme={{ colorScheme: 'dark' }}>
      <App />
    </MantineProvider>
  );
}

Colors

Mantine uses theme.colors.dark values to style components with dark color scheme. Default colors have purple-blue accent:

dark 0

#E7E9EE

dark 1

#D2D3D7

dark 2

#9D9FA4

dark 3

#5c5f66

dark 4

#373A40

dark 5

#2C2E33

dark 6

#25262b

dark 7

#1A1B1E

dark 8

#141517

dark 9

#101113

You can customize these values just like any other color:

<MantineProvider
  theme={{
    colorScheme: 'dark',
    colors: {
      // override dark colors here to change them for all components
      dark: [
        '#d5d7e0',
        '#acaebf',
        '#8c8fa3',
        '#666980',
        '#4d4f66',
        '#34354a',
        '#2b2c3d',
        '#1d1e30',
        '#0c0d21',
        '#01010a',
      ],
    },
  }}
>
  <App />
</MantineProvider>

theme.colors.dark[7] shade is considered to be the body background color and theme.colors.dark[0] shade as text color with dark color scheme. You can create these styles on your own or add GlobalStyles component, which includes them by default. Usually global styles are added on top level component inside MantineProvider:

import { MantineProvider, GlobalStyles } from '@mantine/core';

function Demo() {
  return (
    <MantineProvider theme={{ colorScheme: 'dark' }}>
      <GlobalStyles />
      <YourApp />
    </MantineProvider>
  );
}

Color scheme toggle

Mantine support dynamic color scheme change. To implement this create context that will save colorScheme value and provide handler to change it:

// ColorSchemeContext.jsx file
import { createContext } from 'react';

export default createContext(null);

Then wrap your application with provider:

import { MantineProvider } from '@mantine/core';
import ColorSchemeContext from './ColorSchemeContext';

export default function Demo() {
  const [colorScheme, setColorScheme] = useState('light');

  return (
    <ColorSchemeContext.Provider value={{ colorScheme, onChange: setColorScheme }}>
      <MantineProvider theme={{ colorScheme }}>
        <App />
      </MantineProvider>
    </ColorSchemeContext.Provider>
  );
}

And create theme toggle control:

import { ActionIcon } from '@mantine/core';
import { SunIcon, MoonIcon } from '@modulz/radix-icons';
import ColorSchemeContext from './ColorSchemeContext';

function Demo() {
  const colorSchemeContext = useContext(ColorSchemeContext);
  const dark = colorSchemeContext.colorScheme === 'dark';

  return (
    <ActionIcon
      variant="outline"
      color={dark ? 'yellow' : 'blue'}
      onClick={() => colorSchemeContext.onChange(dark ? 'light' : 'dark')}
      title="Toggle color scheme"
    >
      {dark ? (
        <SunIcon style={{ width: 18, height: 18 }} />
      ) : (
        <MoonIcon style={{ width: 18, height: 18 }} />
      )}
    </ActionIcon>
  );
}

Save to localStorage and add keyboard shortcut

If you want to replicate dark theme behavior of Mantine docs website use use-local-storage-value hook to store theme state in localStorage and sync it across all opened tabs and use-window-event to add Ctrl/⌘ + J keyboard shortcut for theme toggle:

import { MantineProvider } from '@mantine/core';
import { useWindowEvent, useLocalStorageValue } from '@mantine/hooks';
import ColorSchemeContext from './ColorSchemeContext';

export default function Demo() {
  const [colorScheme, setColorScheme] = useLocalStorageValue({
    key: 'mantine-color-scheme',
    defaultValue: 'light',
  });

  useWindowEvent('keydown', (event) => {
    if (event.code === 'KeyJ' && (event.ctrlKey || event.metaKey)) {
      setColorScheme((current) => (current === 'dark' ? 'light' : 'dark'));
    }
  });

  return (
    <ColorSchemeContext.Provider value={{ colorScheme, onChange: setColorScheme }}>
      <MantineProvider theme={{ colorScheme }}>
        <App />
      </MantineProvider>
    </ColorSchemeContext.Provider>
  );
}

Usually saving value to localStorage is not the best strategy as it will create FART. If it is possible store user preferred color scheme on server and serve your application without flashes.

For example, Mantine docs are deployed to gh-pages and do not have server (website is fully static) – in this case if you refresh the page with dark theme, first you will see the prerendered light theme and your selected dark theme will be applied only after a few moments.

Detect user preferred color scheme

You can detect user preferred color scheme with media query or use-color-scheme hook and set is as default value:

import { MantineProvider } from '@mantine/core';
import { useColorScheme } from '@mantine/hooks';
import ColorSchemeContext from './ColorSchemeContext';

export default function Demo() {
  // hook will return either 'dark' or 'light' on client
  // and always 'light' during ssr as window.matchMedia is not available
  const preferredColorScheme = useColorScheme();
  const [colorScheme, setColorScheme] = useState(preferredColorScheme);

  return (
    <ColorSchemeContext.Provider value={{ colorScheme, onChange: setColorScheme }}>
      <MantineProvider theme={{ colorScheme }}>
        <App />
      </MantineProvider>
    </ColorSchemeContext.Provider>
  );
}