SwiftUI background which covers the full-screen and ignores the safe area

FullScreenBackground.swift

struct FullScreenBackground<BackgroundView: View>: ViewModifier {

    @ViewBuilder var backgroundView: () -> BackgroundView

    func body(content: Content) -> some View {
        ZStack() {
            backgroundView().ignoresSafeArea()
            content
        }
    }
}

extension View {

    /// Adds a background which ignores safe area. Use it on the first view in the body of the screen.
    /// - Parameter backgroundView: A view which should be the background.
    /// - Returns: A view with applied background.
    func fullScreenBackground<V>(@ViewBuilder backgroundView: @escaping () -> V) -> some View where V: View {
        modifier(FullScreenBackground(backgroundView: backgroundView))
    }
}

// Usage

SomeView.fullScreenBackground { Color.gray }