# Setting: `app_backdrop_darken_default`

- **Constant:** `ConfigInterface::APP_BACKDROP_DARKEN_DEFAULT`
- **Category:** `app`
- **Type:** `number`
- **Required:** yes
- **Sensitive:** no
- **Validation:** `required|integer|min:0|max:100`
- **Placeholder / default hint:** `0`

## Description

Default backdrop darken overlay in percent (0–100)

## Allowed options

_Free-form / no fixed options_

## Change via CLI

```bash
featherpanel saas getsetting app_backdrop_darken_default
featherpanel saas setsetting app_backdrop_darken_default "<value>"
```

## Change via API

```http
PATCH /api/admin/settings
Content-Type: application/json

{ "app_backdrop_darken_default": "<value>" }
```