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Add dark mode support
Heavily WIP still, but this begins the process of implementing dark mode for our docs and across the project itself. - Color modes are toggled in the docs navbar with a custom toggler, which stores the select color mode in local storage. - Color modes can also be set via data attribute thanks to `data-theme` (with light or dark options available currently). - Docs are heavily WIP for demonstrating the dark mode. - In order to best implement color modes, I've spiked out a number of new Sass and CSS variables (e.g., `--bs-secondary-bg` and `--bs-tertiary-bg`). In addition, I've added new global CSS variables like `--bs-border-color` and more. So, in addition to general color modes and theming support, we get greater real-time customization, too. Todos and open questions: - [ ] Do we refer to these as themes or color modes? - [ ] Do we provide a color mode toggler JS plugin? - [ ] Update all components to better utilize global CSS variables so they can be more easily themed (e.g., see `$dropdown-*` Sass variable changes in the diff).
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Mark Otto
@@ -998,9 +998,13 @@ As part of Bootstrap's evolving CSS variables approach, dropdowns now use local
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{{< scss-docs name="dropdown-css-vars" file="scss/_dropdown.scss" >}}
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Customization through CSS variables can be seen on the `.dropdown-menu-dark` class where we override specific values without adding duplicate CSS selectors.
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{{< callout info >}}
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Dropdown items include at least one variable that is not set on `.dropdown`. This allows you to provide a new value while Bootstrap defaults to a fallback value.
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{{< scss-docs name="dropdown-dark-css-vars" file="scss/_dropdown.scss" >}}
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- `--bs-dropdown-item-border-radius`
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{{< /callout >}}
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Customization through CSS variables can be seen on the `.dropdown-menu-dark` class where we override specific values without adding duplicate CSS selectors.
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### Sass variables
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@@ -6,6 +6,105 @@ group: customize
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toc: true
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---
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## Dark mode
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<small class="d-inline-flex px-2 py-1 fw-semibold text-success bg-success bg-opacity-10 rounded-2">Added in v5.3.0</small>
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**Bootstrap now supports dark mode!** After upgrading to v5.3.0, you'll be able to implement your own color mode toggler (see below for an example from Bootstrap's docs) and apply the different color modes as you see fit. Dark mode styles are scoped to a data attribute, `data-theme="dark"`, which means color modes can be toggled globally on the `<html>` element or on specific components and elements.
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For example, to change the toggle mode of a dropdown menu, add `data-theme="light"` or `data-theme="dark"` to the parent `.dropdown`. Now, no matter the global color mode, these dropdowns will display as intended.
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{{< example class="d-flex justify-content-between" >}}
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<div class="dropdown" data-theme="light">
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<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButtonLight" data-bs-toggle="dropdown" aria-expanded="false">
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Dropdown button
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</button>
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<ul class="dropdown-menu" aria-labelledby="dropdownMenuButtonLight">
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<li><a class="dropdown-item active" href="#">Action</a></li>
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<li><a class="dropdown-item" href="#">Action</a></li>
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<li><a class="dropdown-item" href="#">Another action</a></li>
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<li><a class="dropdown-item" href="#">Something else here</a></li>
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<li><hr class="dropdown-divider"></li>
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<li><a class="dropdown-item" href="#">Separated link</a></li>
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</ul>
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</div>
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<div class="dropdown" data-theme="dark">
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<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButtonDark" data-bs-toggle="dropdown" aria-expanded="false">
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Dropdown button
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</button>
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<ul class="dropdown-menu" aria-labelledby="dropdownMenuButtonDark">
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<li><a class="dropdown-item active" href="#">Action</a></li>
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<li><a class="dropdown-item" href="#">Action</a></li>
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<li><a class="dropdown-item" href="#">Another action</a></li>
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<li><a class="dropdown-item" href="#">Something else here</a></li>
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<li><hr class="dropdown-divider"></li>
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<li><a class="dropdown-item" href="#">Separated link</a></li>
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</ul>
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</div>
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{{< /example >}}
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## Custom color modes
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While the primary use case for color modes is light and dark mode, custom color modes can easily be added. Create your own `data-theme` selector with a custom value as the name of your color mode, then modify the CSS variables as needed.
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For example, you can create a blue theme with the selector `data-theme="blue"`.
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{{< scss-docs name="custom-color-mode" file="site/assets/scss/_content.scss" >}}
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<div class="bd-example text-body bg-body" data-theme="blue">
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<div class="h4">Example blue theme</div>
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<p>Some paragraph text to show how the blue theme might look with written copy.</p>
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<hr class="my-4">
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<div class="dropdown">
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<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButtonDark" data-bs-toggle="dropdown" aria-expanded="false">
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Dropdown button
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</button>
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<ul class="dropdown-menu" aria-labelledby="dropdownMenuButtonDark">
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<li><a class="dropdown-item active" href="#">Action</a></li>
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<li><a class="dropdown-item" href="#">Action</a></li>
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<li><a class="dropdown-item" href="#">Another action</a></li>
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<li><a class="dropdown-item" href="#">Something else here</a></li>
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<li><hr class="dropdown-divider"></li>
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<li><a class="dropdown-item" href="#">Separated link</a></li>
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</ul>
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</div>
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</div>
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```html
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<div data-theme="blue">
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...
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</div>
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```
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## New theme colors
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<small class="d-inline-flex px-2 py-1 fw-semibold text-success bg-success bg-opacity-10 rounded-2">Added in v5.2.0</small>
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Bootstrap's color palette has continued to expand and become more nuanced in v5.2.0 with the addition of new `secondary` and `tertiary` colors. Our new colors are available through Sass and CSS variables (but not our color maps), with the express goal of making it easier to customize across multiple colors modes like light and dark.
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Colors ending in `--rgb` provide the `red, green, blue` values for use in `rgb()` and `rgba()` color modes. For example, `rgba(var(--bs-secondary-bg-rgb), .5)`.
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{{< callout warning>}}
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**Heads up!** There's some potentially confusing things regarding new secondary and tertiary colors, and our secondary theme color.
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{{< /callout >}}
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{{< bs-table "table text-start table-swatches" >}}
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| Description | Swatch | Variables |
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| --- | --- | --- |
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| **Body —** Default foreground (color) and background, including components. | <div class="p-3 mb-1 rounded-2" style="background-color: var(--bs-body-color);"> </div> <div class="p-3 rounded-2 border" style="background-color: var(--bs-body-bg);"> </div> | `--bs-body-color`<br>`--bs-body-color-rgb`<br>`--bs-body-bg`<br>`--bs-body-bg-rgb` |
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| **Secondary —** For disabled states, dividers, and lighter text. | <div class="p-3 mb-1 rounded-2" style="background-color: var(--bs-secondary-color);"> </div> <div class="p-3 rounded-2" style="background-color: var(--bs-secondary-bg);"> </div> | `--bs-secondary-color`<br>`--bs-secondary-color-rgb`<br>`--bs-secondary-bg`<br>`--bs-secondary-bg-rgb` |
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| **Tertiary —** For hovers, accents, wells, and text. | <div class="p-3 mb-1 rounded-2" style="background-color: var(--bs-tertiary-color);"> </div> <div class="p-3 rounded-2" style="background-color: var(--bs-tertiary-bg);"> </div> | `--bs-tertiary-color`<br>`--bs-tertiary-color-rgb`<br>`--bs-tertiary-bg`<br>`--bs-tertiary-bg-rgb` |
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| **Border —** For component borders, dividers, and rules. Blends with background colors thanks to `rgba()` values. | <div class="p-3 rounded-2" style="background-color: var(--bs-border-color);">Border color</div> | `--bs-border-color` |
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| **Primary —** Main theme color, used for hyperlinks, focus styles, and component and form active states. | <div class="p-3 text-body rounded-2" style="background-color: var(--bs-primary);">Primary</div> | `--bs-primary`<br>`--bs-primary-rgb` |
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| **Success —** Theme color used for positive or succesful actions and information. | <div class="p-3 text-body rounded-2" style="background-color: var(--bs-success);">Success</div> | `--bs-success`<br>`--bs-success-rgb` |
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| **Danger —** Theme color used for errors and dangerous actions. | <div class="p-3 text-body rounded-2" style="background-color: var(--bs-danger);">Danger</div> | `--bs-danger`<br>`--bs-danger-rgb` |
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| **Warning —** Theme color used for warning messages. | <div class="p-3 text-body rounded-2" style="background-color: var(--bs-warning);">Warning</div> | `--bs-warning`<br>`--bs-warning-rgb` |
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| **Info —** Theme color used for neutral and informative content. | <div class="p-3 text-body rounded-2" style="background-color: var(--bs-info);">Info</div> | `--bs-info`<br>`--bs-info-rgb` |
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{{< /bs-table >}}
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## Theme colors
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We use a subset of all colors to create a smaller color palette for generating color schemes, also available as Sass variables and a Sass map in Bootstrap's `scss/_variables.scss` file.
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@@ -46,7 +46,7 @@ Customize the prefix via the `$prefix` Sass variable. By default, it's set to `b
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CSS variables offer similar flexibility to Sass's variables, but without the need for compilation before being served to the browser. For example, here we're resetting our page's font and link styles with CSS variables.
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```css
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```scss
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body {
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font: 1rem/1.5 var(--bs-font-sans-serif);
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}
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