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----
-title: Theming
-path: support/theming
-status: New
-bundle: support
----
-
-Primer CSS offers multiple color themes for components and utilities. The colors change based on the active theme and color mode.
-
-Currently there are 3 themes (`light`, `dark`, `dark_dimmed`) to choose from. When nothing is specified, Primer CSS uses the `light` theme.
-
-## Set a theme
-
-Configure Primer CSS to use a certain theme by adding the following attributes:
-
-- `data-color-mode` with a value of either `light` or `dark`
-- either `data-light-theme` or `data-dark-theme` with a value of either `light`, `dark`, `dark_dimmed`
-
-The attributes can be added to any element, but ideally it should be added to the document root (``). Below an example to use the `dark_dimmed` theme:
-
-```html
-
-```
-
-More examples:
-
-```html live
-
-```
-
-
-
-## Sync to the system
-
-If the theme should be synced to the OS's color mode, use `data-color-mode="auto"` and set a `data-light-theme` as well as a `data-dark-theme`.
-
-```html live
-
-```
-
-Change the color mode of your OS to see the switch between the `data-light-theme="light"` and `data-dark-theme="dark_dimmed"`.
-
-## Custom color variables
-
-It's recommended to use the [functional variables](/support/color-system#functional-variables) as much as possible. It will guarantee that the variables will work as expected with any new theme that might get added in the future. Somtimes you might still need a custom variable that changes based on the color mode. You can create a custom variable with the `color-variables` mixin.
-
-```css
-@include color-variables(
- ("custom-css-variable-1": (
- light: var(--color-scale-gray-3),
- dark: var(--color-scale-gray-5)
- ),
- "custom-css-variable-2": (
- light: var(--color-scale-gray-2),
- dark: var(--color-scale-gray-6)
- ),
- "custom-css-variable-3": (
- light: var(--color-scale-gray-2),
- dark: var(--color-scale-gray-6)
- )
-));
-```
-
-The custom variables will be prefixed with `--color-` and can be used in the same way as other functional variables.
-
-```css
-.my-class {
- color: var(--color-custom-css-variable-1);
- background-color: var(--color-custom-css-variable-2);
- border-color: var(--color-custom-css-variable-2);
-}
-```
-
-## Auto variables
-
-If you tried using the [`scale` color variables](/support/color-system#color-variables) you might have noticed that they are not that useful with multiple color modes. That's because they stay light or dark in any color mode. As seen above, you could create custom variables that invert the scale like so:
-
-```css
-@include color-variables(
- ("custom-css-variable": (
- light: var(--color-scale-gray-7),
- dark: var(--color-scale-gray-2)
- )
-));
-
-.my-class {
- color: var(--color-custom-css-variable);
-}
-```
-
-In this case, the `auto` variables might come in handy.
-
-```css
-.my-class {
- color: var(--color-auto-gray-7);
-}
-```
-
-The benefit of `auto` over the `scale` variables is that `auto` variables automatically get inverted in dark mode.
-
-```html live
-