---
status: "published"
label: "Updating the Theme"
title: "Customize Your Shadcn UI Theme Colors | Next.js Supabase SaaS Kit"
order: 0
description: "Configure brand colors, dark mode, and Shadcn UI theme variables in your Makerkit application using Tailwind CSS 4."
---

Customize your application's color scheme by editing `apps/web/styles/theme.css`. This file defines all theme variables (`:root` and `.dark`) that Shadcn UI components use, giving you complete control over your brand colors in both light and dark modes.

## Quick Theme Change

The fastest way to update your theme is to use the [Shadcn UI Themes page](https://ui.shadcn.com/themes):

1. Choose a color scheme on the Shadcn theme builder
2. Copy the generated CSS variables
3. Paste them into `apps/web/styles/theme.css`
4. Wrap color values with `hsl()` or `oklch()` functions (Tailwind CSS 4 requirement)

## Theme File Structure

Makerkit's theming uses three CSS files in `apps/web/styles/`:

| File | Purpose |
|------|---------|
| `theme.css` | Your theme colors - `:root` and `.dark` variables (edit this file) |
| `shadcn-ui.css` | Maps CSS variables to Tailwind's `@theme inline` system |
| `globals.css` | Imports all styles and base Tailwind directives |

## Core Theme Variables

Edit `apps/web/styles/theme.css` to customize these color groups. Colors use oklch format:

```css title="apps/web/styles/theme.css"
:root {
  /* Background and text */
  --background: oklch(1 0 0);
  --foreground: oklch(0.145 0 0);

  /* Primary brand color (buttons, links, focus rings) */
  --primary: oklch(0.205 0 0);
  --primary-foreground: oklch(0.985 0 0);

  /* Secondary actions and elements */
  --secondary: oklch(0.97 0 0);
  --secondary-foreground: oklch(0.205 0 0);

  /* Muted backgrounds and text */
  --muted: oklch(0.97 0 0);
  --muted-foreground: oklch(0.556 0 0);

  /* Hover states and accents */
  --accent: oklch(0.97 0 0);
  --accent-foreground: oklch(0.205 0 0);

  /* Destructive actions (delete, error) */
  --destructive: oklch(0.58 0.22 27);

  /* Cards and popovers */
  --card: oklch(1 0 0);
  --card-foreground: oklch(0.145 0 0);
  --popover: oklch(1 0 0);
  --popover-foreground: oklch(0.145 0 0);

  /* Borders and inputs */
  --border: oklch(0.922 0 0);
  --input: oklch(0.922 0 0);
  --ring: oklch(0.708 0 0);

  /* Border radius */
  --radius: 0.625rem;

  /* Sidebar-specific colors */
  --sidebar: oklch(0.985 0 0);
  --sidebar-foreground: oklch(0.145 0 0);
  --sidebar-primary: oklch(0.205 0 0);
  --sidebar-primary-foreground: oklch(0.985 0 0);
  --sidebar-accent: oklch(0.97 0 0);
  --sidebar-accent-foreground: oklch(0.205 0 0);
  --sidebar-border: oklch(0.922 0 0);
  --sidebar-ring: oklch(0.708 0 0);

  /* Chart colors */
  --chart-1: oklch(0.809 0.105 251.813);
  --chart-2: oklch(0.623 0.214 259.815);
  --chart-3: oklch(0.546 0.245 262.881);
  --chart-4: oklch(0.488 0.243 264.376);
  --chart-5: oklch(0.424 0.199 265.638);
}
```

## Dark Mode Configuration

Define dark mode colors in the `.dark` class within the same file:

```css title="apps/web/styles/theme.css"
.dark {
  --background: oklch(0.145 0 0);
  --foreground: oklch(0.985 0 0);

  --primary: oklch(0.87 0 0);
  --primary-foreground: oklch(0.16 0 0);

  --secondary: oklch(0.269 0 0);
  --secondary-foreground: oklch(0.985 0 0);

  --muted: oklch(0.269 0 0);
  --muted-foreground: oklch(0.708 0 0);

  --accent: oklch(0.371 0 0);
  --accent-foreground: oklch(0.985 0 0);

  --destructive: oklch(0.704 0.191 22.216);

  --card: oklch(0.16 0 0);
  --card-foreground: oklch(0.985 0 0);
  --popover: oklch(0.16 0 0);
  --popover-foreground: oklch(0.985 0 0);

  --border: oklch(1 0 0 / 10%);
  --input: oklch(1 0 0 / 15%);
  --ring: oklch(0.556 0 0);

  --sidebar: oklch(0.16 0 0);
  --sidebar-foreground: oklch(0.985 0 0);
  --sidebar-primary: oklch(0.488 0.243 264.376);
  --sidebar-primary-foreground: oklch(0.985 0 0);
  --sidebar-accent: oklch(0.269 0 0);
  --sidebar-accent-foreground: oklch(0.985 0 0);
  --sidebar-border: oklch(1 0 0 / 10%);
  --sidebar-ring: oklch(0.556 0 0);
}
```

## Converting Shadcn Theme Colors to Tailwind CSS 4

Shadcn's theme builder outputs HSL values without the function wrapper. Tailwind CSS 4 requires explicit color functions.

**Shadcn output:**
```css
--primary: 222.2 47.4% 11.2%;
```

**Tailwind CSS 4 format:**
```css
--primary: hsl(222.2 47.4% 11.2%);
```

You can also use `oklch()` for better color perception:
```css
--primary: oklch(21.03% 0.0318 264.65);
```

Use any AI tool or color converter to transform the values. The key is ensuring every color value is wrapped in a color function.

## Using Tailwind Color Palette

Reference Tailwind's built-in colors using CSS variables:

```css
--primary: var(--color-blue-600);
--destructive: var(--color-red-500);
--accent: var(--color-indigo-100);
```

Available color scales: `slate`, `gray`, `zinc`, `neutral`, `stone`, `red`, `orange`, `amber`, `yellow`, `lime`, `green`, `emerald`, `teal`, `cyan`, `sky`, `blue`, `indigo`, `violet`, `purple`, `fuchsia`, `pink`, `rose`.

Each scale includes shades from `50` (lightest) to `950` (darkest).

## Theme Mode Configuration

Control how theme switching works with these environment variables:

```bash title=".env.local"
# Default theme: light, dark, or system
NEXT_PUBLIC_DEFAULT_THEME_MODE=system

# Show/hide the theme toggle in the UI
NEXT_PUBLIC_ENABLE_THEME_TOGGLE=true
```

## Custom Brand Color Example

Here's a complete example using a custom indigo brand color:

```css title="apps/web/styles/theme.css"
:root {
  --primary: oklch(0.457 0.24 277.023);       /* indigo-600 */
  --primary-foreground: oklch(1 0 0);          /* white */

  --secondary: oklch(0.943 0.029 282.832);     /* indigo-100 */
  --secondary-foreground: oklch(0.272 0.174 282.572); /* indigo-900 */

  --accent: oklch(0.969 0.014 282.832);        /* indigo-50 */
  --accent-foreground: oklch(0.272 0.174 282.572);

  --ring: oklch(0.539 0.233 277.117);          /* indigo-500 */
}

.dark {
  --primary: oklch(0.673 0.208 277.568);       /* indigo-400 */
  --primary-foreground: oklch(0.208 0.153 283.264); /* indigo-950 */

  --secondary: oklch(0.272 0.174 282.572);     /* indigo-900 */
  --secondary-foreground: oklch(0.943 0.029 282.832);

  --accent: oklch(0.351 0.209 281.288);        /* indigo-800 */
  --accent-foreground: oklch(0.943 0.029 282.832);

  --ring: oklch(0.673 0.208 277.568);          /* indigo-400 */
}
```

## Common Mistakes

**Forgetting color function wrappers**: Tailwind CSS 4 requires `hsl()`, `oklch()`, or `rgb()` around color values. Raw space-separated values like `222 47% 11%` won't work.

**Low contrast ratios**: Ensure sufficient contrast between foreground and background colors. Use tools like [WebAIM Contrast Checker](https://webaim.org/resources/contrastchecker/) to verify WCAG compliance.

**Inconsistent dark mode**: Always define dark mode variants for every color you customize. Missing dark mode variables cause jarring visual inconsistencies.

**Not testing all components**: Theme changes affect every Shadcn component. After updating colors, click through your app to verify buttons, inputs, cards, and dialogs all look correct.

## Verification

After updating your theme:

1. Start the dev server: `pnpm dev`
2. Toggle between light and dark modes
3. Check these component types:
   - Primary buttons (`--primary`)
   - Form inputs (`--input`, `--border`, `--ring`)
   - Cards and dialogs (`--card`, `--popover`)
   - Destructive actions (`--destructive`)
   - Sidebar navigation (`--sidebar-*` variables)

{% faq
   title="Frequently Asked Questions"
   items=[
     {"question": "How do I use a custom color not in Tailwind's palette?", "answer": "Define your color using hsl() or oklch() functions directly. For example: --primary: hsl(250 60% 45%). You can use any valid CSS color value wrapped in a color function."},
     {"question": "Why do my colors look different than the Shadcn theme preview?", "answer": "Tailwind CSS 4 requires explicit color functions (hsl, oklch, rgb). Convert space-separated HSL values to hsl() function calls. Also ensure you're using the same color space."},
     {"question": "Can I have different themes for different pages?", "answer": "The theme applies globally. For page-specific styling, use CSS classes or component-level overrides rather than modifying theme variables. You could also implement a theme context for programmatic switching."},
     {"question": "How do I disable dark mode entirely?", "answer": "Set NEXT_PUBLIC_DEFAULT_THEME_MODE=light and NEXT_PUBLIC_ENABLE_THEME_TOGGLE=false in your environment variables. This forces light mode and hides the toggle."}
   ]
/%}

## Next Steps

- Back to [Customization Overview](/docs/next-supabase-turbo/customization)
- Set up your [Tailwind CSS configuration](/docs/next-supabase-turbo/customization/tailwind-css) for additional customizations
- Configure [custom fonts](/docs/next-supabase-turbo/customization/fonts) for your brand typography
- Update your [application logo](/docs/next-supabase-turbo/customization/logo) to match your theme