Reusable SwiftUI ViewModifier and Shape Styling

import SwiftUI

struct SurfaceCardModifier: ViewModifier {
    func body(content: Content) -> some View {
        content
            .padding(16)
            .background(.background, in: RoundedRectangle(cornerRadius: 16))
            .overlay {
                RoundedRectangle(cornerRadius: 16)
                    .strokeBorder(.quaternary)
            }
    }
}

extension View {
    func surfaceCard() -> some View { modifier(SurfaceCardModifier()) }
}