Theming

Customize MUI with your theme. You can change the colors, the typography and much more.

The theme specifies the color of the components, darkness of the surfaces, level of shadow, appropriate opacity of ink elements, etc.

Themes let you apply a consistent tone to your app. It allows you to customize all design aspects of your project in order to meet the specific needs of your business or brand.

To promote greater consistency between apps, light and dark theme types are available to choose from. By default, components use the light theme type.

Theme provider

If you wish to customize the theme, you need to use the ThemeProvider component in order to inject a theme into your application. However, this is optional; MUI components come with a default theme.

ThemeProvider relies on the context feature of React to pass the theme down to the components, so you need to make sure that ThemeProvider is a parent of the components you are trying to customize. You can learn more about this in the API section.

Theme configuration variables

Changing the theme configuration variables is the most effective way to match MUI to your needs. The following sections cover the most important theme variables:

• .palette
• .typography
• .spacing
• .breakpoints
• .zIndex
• .transitions
• .components

You can check out the default theme section to view the default theme in full.

Custom variables

When using MUI's theme with MUI System or any other styling solution, it can be convenient to add additional variables to the theme so you can use them everywhere. For instance:

const theme = createTheme({
  status: {
    danger: orange[500],
  },
});

WARNING: vars is a private field used for CSS variables support. It will throw an error if you try to use it:

createTheme({
  vars: { ... },
})

If you are using TypeScript, you would also need to use module augmentation for the theme to accept the above values.

declare module '@mui/material/styles' {
  interface Theme {
    status: {
      danger: string;
    };
  }
  // allow configuration using `createTheme`
  interface ThemeOptions {
    status?: {
      danger?: string;
    };
  }
}

Theme builder

The community has built great tools to build a theme:

• mui-theme-creator: A tool to help design and customize themes for the MUI component library. Includes basic site templates to show various components and how they are affected by the theme
• Material palette generator: The Material palette generator can be used to generate a palette for any color you input.

Accessing the theme in a component

You can access the theme variables inside your functional React components using the useTheme hook:

import { useTheme } from '@mui/material/styles';

function DeepChild() {
  const theme = useTheme();
  return <span>{`spacing ${theme.spacing}`}</span>;
}

Nesting the theme

You can nest multiple theme providers.

The inner theme will override the outer theme. You can extend the outer theme by providing a function:

API

createTheme(options, ...args) => theme

Generate a theme base on the options received. Then, pass it as a prop to ThemeProvider.

Arguments

1. options (object): Takes an incomplete theme object and adds the missing parts.
2. ...args (object[]): Deep merge the arguments with the about to be returned theme.

import { deepmerge } from '@mui/utils';
import { createTheme } from '@mui/material/styles';

const theme = createTheme(deepmerge(options1, options2));

Returns

theme (object): A complete, ready-to-use theme object.

Examples

import { createTheme } from '@mui/material/styles';
import { green, purple } from '@mui/material/colors';

const theme = createTheme({
  palette: {
    primary: {
      main: purple[500],
    },
    secondary: {
      main: green[500],
    },
  },
});

Theme composition: using theme options to define other options

When the value for a theme option is dependent on another theme option, you should compose the theme in steps.

import { createTheme } from '@mui/material/styles';

let theme = createTheme({
  palette: {
    primary: {
      main: '#0052cc',
    },
    secondary: {
      main: '#edf2ff',
    },
  },
});

theme = createTheme(theme, {
  palette: {
    info: {
      main: theme.palette.secondary.main,
    },
  },
});

Think of creating a theme as a two-step composition process: first, you define the basic design options; then, you'll use these design options to compose other options.

WARNING: theme.vars is a private field used for CSS variables support. Please use another name for a custom object.

responsiveFontSizes(theme, options) => theme

Generate responsive typography settings based on the options received.

Arguments

1. theme (object): The theme object to enhance.
2. options (object [optional]):

• breakpoints (array<string> [optional]): Default to ['sm', 'md', 'lg']. Array of breakpoints (identifiers).
• disableAlign (bool [optional]): Default to false. Whether font sizes change slightly so line heights are preserved and align to Material Design's 4px line height grid. This requires a unitless line height in the theme's styles.
• factor (number [optional]): Default to 2. This value determines the strength of font size resizing. The higher the value, the less difference there is between font sizes on small screens. The lower the value, the bigger font sizes for small screens. The value must be greater than 1.
• variants (array<string> [optional]): Default to all. The typography variants to handle.

Returns

theme (object): The new theme with a responsive typography.

Examples

import { createTheme, responsiveFontSizes } from '@mui/material/styles';

let theme = createTheme();
theme = responsiveFontSizes(theme);

unstable_createMuiStrictModeTheme(options, ...args) => theme

WARNING: Do not use this method in production.

Generates a theme that reduces the amount of warnings inside React.StrictMode like Warning: findDOMNode is deprecated in StrictMode.

Requirements

Currently unstable_createMuiStrictModeTheme adds no additional requirements.

Arguments

1. options (object): Takes an incomplete theme object and adds the missing parts.
2. ...args (object[]): Deep merge the arguments with the about to be returned theme.

Returns

theme (object): A complete, ready-to-use theme object.

Examples

import { unstable_createMuiStrictModeTheme } from '@mui/material/styles';

const theme = unstable_createMuiStrictModeTheme();

function App() {
  return (
    <React.StrictMode>
      <ThemeProvider theme={theme}>
        <LandingPage />
      </ThemeProvider>
    </React.StrictMode>
  );
}

ThemeProvider

This component takes a theme prop and applies it to the entire React tree that it is wrapping around. It should preferably be used at the root of your component tree.

Props

Examples

import * as React from 'react';
import { red } from '@mui/material/colors';
import { ThemeProvider, createTheme } from '@mui/material/styles';

const theme = createTheme({
  palette: {
    primary: {
      main: red[500],
    },
  },
});

function App() {
  return <ThemeProvider theme={theme}>...</ThemeProvider>;
}