> For the complete documentation index, see [llms.txt](https://docs.fortifiedid.se/common/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fortifiedid.se/common/overview.md).

# Overview

All Fortified ID frontend applications support organisation-specific branding through an overlay mechanism. An overlay controls logos, favicon, background image, colors, titles, and logo behavior across different flows.

Each overlay consists of six files inside an organisation-specific `assets` folder. Together, these files let you adapt the look and feel of authentication pages, forms, portal, password reset, and other apps without modifying application code.

## Overlay files

| File                       | Purpose                                                                          |
| -------------------------- | -------------------------------------------------------------------------------- |
| `css_overrides.css`        | Colors, buttons, links, progress bar, header, loader, background.                |
| `ui_config_overrides.json` | Names, titles, logo files, logo sizes, footer link, per-flow logo visibility.    |
| `background.svg`           | Background asset for authentication pages.                                       |
| `logo.svg`                 | Primary logo used on access pages and in the footer.                             |
| `logo_vit.*`               | Negative or white logo variant used in app mode (portal, forms, password reset). |
| `favicon.ico`              | Site icon shown in the browser tab.                                              |

See [Overlay](/common/overlay.md) for file details and asset guidelines, [CSS](/common/css.md) for the full list of customizable CSS variables, and [UI Configuration Overrides](/common/ui-configuration-overrides.md) for JSON config reference.

## Examples

### Authentication selector

The default selector page with annotated overlay areas, and an organisation-specific override.

<figure><img src="/files/nfeX1godVU3Qs1ntnkVt" alt="Default authentication selector with overlay areas annotated"><figcaption><p>Default authentication selector</p></figcaption></figure>

<figure><img src="/files/7KMaoUvUtZCMddcmAitH" alt="Organisation-specific authentication selector override"><figcaption><p>Organisation-specific override</p></figcaption></figure>

### Portal

The default portal page with annotated overlay areas, and an organisation-specific override.

<figure><img src="/files/7u15n6BiDZ7zRnDBtozc" alt="Default portal with overlay areas annotated"><figcaption><p>Default portal</p></figcaption></figure>

<figure><img src="/files/aZ0QealdojwMC2cbaOcn" alt="Organisation-specific portal override"><figcaption><p>Organisation-specific override</p></figcaption></figure>


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