@material/theme

Theme

This color palette comprises primary and secondary colors that can be used for illustration or to develop your brand colors.

MDC Theme is a foundational module that themes MDC Web components. The colors in this module are derived from three theme colors:

• Primary: the primary color used in your application, applies to a number of UI elements.
• Secondary: the secondary color used in your application, applies to a number of UI elements. (Previously called "accent".)
• Background: the background color for your application, aka the color on top of which your UI is drawn.

and five text styles:

• Primary: used for most text
• Secondary: used for text which is lower in the visual hierarchy
• Hint: used for text hints, such as those in text fields and labels
• Disabled: used for text in disabled components and content
• Icon: used for icons

A note about Primary and Secondary, don't confuse primary/secondary color with primary/secondary text. The former refers to the primary/secondary theme color that is used to establish a visual identity and color many parts of your application. The latter refers to the style of text that is most prominent (low opacity, high contrast), and used to display most content.

Design & API Documentation

• Material Design guidelines: Color
• Demo

Installation

npm install @material/theme

Usage

Change Theme Colors

MDC Theme makes it easy to develop your brand colors. You override the default theme color through Sass variables or CSS custom properties. CSS custom properties enables runtime theming.

A note about Sass variables, you need to define the three theme color variables before importing mdc-theme or any MDC Web components that rely on it, like following:

$mdc-theme-primary: #9c27b0; // Purple 500
$mdc-theme-secondary: #ffab40; // Orange A200
$mdc-theme-background: #fff; // White

@import "@material/theme/mdc-theme";

A note about $mdc-theme-secondary: This variable was previously named $mdc-theme-accent. For backward compatibility, $mdc-theme-accent still exists, but it is deprecated. Apps that previously customized $mdc-theme-accent will continue to work, but new apps should use $mdc-theme-secondary instead.

The text color, for text placed on top of these selected theme colors, is programmatically computed based on color contrast. We follow the Web Content Accessibility Guidelines 2.0.

https://www.w3.org/TR/WCAG20

CSS Custom Properties

A note about <TEXT_STYLE> and <THEME_COLOR>, <TEXT_STYLE> represents the lowercase name of the text styles listed above, e.g. hint. <THEME_COLOR> represents the lowercase name of the theme colors listed above, e.g. secondary. When you put it all together it would be --mdc-theme-text-hint-on-secondary.

CSS Custom property	Description
--mdc-theme-primary	The theme primary color
--mdc-theme-secondary	The theme secondary color
--mdc-theme-background	The theme background color
--mdc-theme-text-<TEXT_STYLE>-on-<THEME_COLOR>	Text color for TEXT_STYLE on top of THEME_COLOR background
--mdc-theme-text-<TEXT_STYLE>-on-light	Text color for TEXT_STYLE on top of light background
--mdc-theme-text-<TEXT_STYLE>-on-dark	Text color for TEXT_STYLE on top of dark background

CSS Classes

MDC Web provides SASS mixins, such as mdc-button-filled-accessible, to facilitate customization of some components. For more information, consult the documentation for each component.

If you want to modify an element, which is not a Material Design component, you can apply the following modifier CSS classes.

A note about <TEXT_STYLE> and <THEME_COLOR>, <TEXT_STYLE> represents the lowercase name of the text styles listed above, e.g. hint. <THEME_COLOR> represents the lowercase name of the theme colors listed above, e.g. secondary. When you put it all together it would be mdc-theme--text-hint-on-secondary.

CSS Class	Description
mdc-theme--primary	Sets the text color to the theme primary color
mdc-theme--secondary	Sets the text color to the theme secondary color
mdc-theme--background	Sets the background color to the theme background color
mdc-theme--primary-bg	Sets the background color to the theme primary color
mdc-theme--secondary-bg	Sets the background color to the theme secondary color
mdc-theme--text-<TEXT_STYLE>-on-<THEME_COLOR>	Sets text to a suitable color for TEXT_STYLE on top of THEME_COLOR background
mdc-theme--text-<TEXT_STYLE>-on-light	Sets text to a suitable color for TEXT_STYLE on top of light background
mdc-theme--text-<TEXT_STYLE>-on-dark	Sets text to a suitable color for TEXT_STYLE on top of dark background

Sass Mixins, Variables, and Functions

Mixin	Description
mdc-theme-prop($property, $style, $important, $edgeOptOut)	Applies a theme color or a custom color to a CSS property, optionally with !important. If $edgeOptOut is true and a theme color is passed, the style will be wrapped in a @supports clause to exclude the style in Edge to avoid issues with its buggy CSS variable support.

mdc-theme-prop Properties

The properties below can be used as the $style argument for the mdc-theme-prop mixin. Literal color values (e.g., rgba(0, 0, 0, .75)) may also be used instead.

A note about <TEXT_STYLE> and <THEME_COLOR>, <TEXT_STYLE> represents the lowercase name of the text styles listed above, e.g. hint. <THEME_COLOR> represents the lowercase name of the theme colors listed above, e.g. secondary. When you put it all together it would be text-hint-on-secondary.

Property Name	Description
primary	The theme primary color
secondary	The theme secondary color
background	The theme background color
text-<TEXT_STYLE>-on-<THEME_COLOR>	TEXT_STYLE on top of THEME_COLOR background
text-<TEXT_STYLE>-on-light	TEXT_STYLE on top of a light background
text-<TEXT_STYLE>-on-dark	TEXT_STYLE on top of a dark background

mdc-theme-luminance($color)

Calculates the luminance value (0 - 1) of a given color.

@debug mdc-theme-luminance(#9c27b0); // 0.11654

mdc-theme-contrast($back, $front)

Calculates the contrast ratio between two colors.

@debug mdc-theme-contrast(#9c27b0, #000); // 3.33071

mdc-theme-tone($color)

Determines whether the given color is "light" or "dark".

If the input color is a string literal equal to "light" or "dark", it will be returned verbatim.

@debug mdc-theme-tone(#9c27b0); // dark
@debug mdc-theme-tone(light);   // light

mdc-theme-contrast-tone($color)

Determines whether to use light or dark text on top of a given color.

@debug mdc-theme-contrast-tone(#9c27b0); // light

mdc-theme-prop-value($property)

If $property is a literal color value (e.g., blue, #fff), it is returned verbatim. Otherwise, the value of the corresponding theme property (from $mdc-theme-property-values) is returned. If $property is not a color and no such theme property exists, an error is thrown.

This is mainly useful in situations where mdc-theme-prop cannot be used directly (e.g., box-shadow).

Unlike the mdc-theme-prop mixin, this function does not support CSS custom properties. It only returns the raw color value of the specified theme property.

NOTE: This function is defined in _variables.scss instead of _functions.scss to avoid circular imports.

@debug mdc-theme-prop-value(primary); // #3f51b5
@debug mdc-theme-prop-value(blue);    // blue

mdc-theme-accessible-ink-color($fill-color, $text-style: primary)

Returns an accessible ink color that has sufficient contrast against the given fill color.

Params:

• $fill-color: Supports the same values as mdc-theme-prop-value
• $text-style: Value must be one of primary, secondary, hint, disabled, icon (see $mdc-theme-text-colors)

NOTE: This function is defined in _variables.scss instead of _functions.scss to avoid circular imports.

@debug mdc-theme-accessible-ink-color(secondary); // rgba(0, 0, 0, .87) (text-primary-on-light)
@debug mdc-theme-accessible-ink-color(blue);      // white              (text-primary-on-dark)