# Custom Global Styles

In some scenarios, you may need to add some global styles based on the theme UI. The framework provides a config param `globalStyles` to implement it.

## Usage

Add the following config to `modern.config.ts`:

```ts title="modern.config.ts"
import docTools, { defineConfig } from '@modern-js/doc-tools';
import path from 'path';

export default defineConfig({
  doc: {
    globalStyles: [path.join(__dirname, 'styles/index.css')],
  },
  plugins: [docTools()],
});
```

Then you can add the following code:

```css
/* styles/index.css */
:root {
  --modern-c-brand: #f00;
}
```

In this way, the framework will automatically collect all global styles and merge them into the final style file.

Below are some commonly used global styles:

```css
/* styles/index.css */

:root {
  /* Modify the theme color */
  --modern-c-brand: #f00;
  --modern-c-brand-dark: #ffa500;
  --modern-c-brand-darker: #c26c1d;
  --modern-c-brand-light: #f2a65a;
  --modern-c-brand-lighter: #f2a65a;

  /* Modify the width of the left sidebar */
  --modern-sidebar-width: 280px;

  /* Modify the width of the right outline column */
  --modern-aside-width: 256px;

  /* Modify the code block title background */
  --modern-code-title-bg: rgba(250, 192, 61, 0.15);

  /* Modify the code block content background */
  --modern-code-block-bg: rgba(214, 188, 70, 0.05);
}
```

> If you want to know more about internal global styles, you can check [vars.css](https://github.com/web-infra-dev/modern.js/blob/main/packages/cli/doc-core/src/theme-default/styles/vars.css).
