---
title: systemDark
framework: swiftui
role: symbol
role_heading: Type Property
path: swiftui/surroundingseffect/systemdark
---

# systemDark

An effect that dims passthrough video.

## Declaration

```swift
static var systemDark: SurroundingsEffect { get }
```

## Discussion

Discussion Use this value with the preferredSurroundingsEffect(_:) view modifier when you want to dim passthrough video while displaying a particular view. Doing so helps to draw attention to your app’s content while still enabling people to remain aware of their surroundings.