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supabase/packages/ui/tailwind-theming.md
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# Tailwind theming
Supabase is migrating to use tailwind classes that use CSS properties.
This is to support the concept of theming, so that:
1. It is easy for the team to update the theme without changing 100s of files.
2. We could offer custom or additional themes in future.
## Primitives
We (the Supabase Design team ✨) define primitive color values using Figma Variables.
- `foreground`
- `background`
- `border`
- `brand` (could become primary)
- `destructive`
- `warning`
These values are exported from Figma as a .json file and transformed into tailwind utilities through some scripts under `packages/ui/internals/tokens`.
Primitives work the same way as any other color. They should follow some basic usage patterns such as _foreground_ on text and _background_ on surfaces, but they can also be combined with any tailwind utility to achieve more advanced layouts.
For example, `foreground-light` can also be applied on borders and backgrounds as `border-foreground-light` and `bg-foreground-light`, if needed.
Similarly, background and border primitives can be used on other tailwind utilities.
```
border-surface-100
bg-border-overlay
text-background-surface-100
```
## Usage
The following tailwind classes are a combination of tailwind utilities and our primitives. They're under development and are likely to change but most are now in use and will probably be permanent fixtures.
### Foreground (Text)
| Value | Usage |
| ---------------------- | -------------------------------------- |
| `foreground-{DEFAULT}` | Default text (**DEFAULT** is optional) |
| `foreground-light` | Light text |
| `foreground-lighter` | Lighter text |
| `foreground-muted` | Muted text |
Examples:
```
text-foreground
text-foreground-light
text-foreground-lighter
text-foreground-muted
bg-foreground-light
```
---
### Background
| Value | Usage |
| ------------------------------- | ------------------------------------------------------------ |
| `{background}-{DEFAULT}` | Main body background (**DEFAULT** is optional) |
| `{background}-surface-100` | Panels and surfaces on the same level of the main background |
| `{background}-surface-200` | Surfaces that overlap the main content (ex. dropdowns) |
| `{background}-surface-300` | Surfaces that are stacked above {background}-surface-200 |
| `{background}-alternative` | Alternative background (inverted) |
| `{background}-overlay` | Overlays, Dropdowns, Popovers |
| `{background}-control` | Inputs, Radios, Checkboxes |
| `{background}-button-{DEFAULT}` | Button default |
The `background` part can be omitted when used on the `bg` tailwind utility.
Examples:
```
bg-surface-100
bg-overlay
bg-alternative
text-background-surface-100
```
---
### Border
| Value | Usage |
| ------------------------- | ---------------------------------------- |
| `border-{DEFAULT}` | Default border (**DEFAULT** is optional) |
| `border-secondary` | Secondary border |
| `border-alternative` | Alternative border (inverted) |
| `border-overlay` | Overlays, Dropdowns, Popovers |
| `border-control` | Inputs, Radios, Checkboxes |
| `border-strong` | Hover, Focus |
| `border-stronger` | Highlighted border |
| `border-button-{DEFAULT}` | Button default border |
| `border-button-hover` | Button default border hover |
Examples:
```
border-overlay
border-alternative
text-border-control
```
### Brand
| Value |
| --------- |
| `200` |
| `300` |
| `400` |
| `500` |
| `DEFAULT` |
| `600` |
| `button` |
### Destructive
| Value |
| --------- |
| `200` |
| `300` |
| `400` |
| `500` |
| `DEFAULT` |
| `600` |
### Warning
| Value |
| --------- |
| `200` |
| `300` |
| `400` |
| `500` |
| `DEFAULT` |
| `600` |