struct ContentView: View {
    var body: some View {
        ParticlesEmitter {
            EmitterCell()
                .content(.circle(1.0))
                .color(.white)
                .lifetime(20)
                .birthRate(5)
                .velocity(100)
                .scaleSpeed(-0.2)
                .yAcceleration(100)
        }
        .emitterSize(.init(width: 64, height: 8))
        .emitterShape(.rectangle)
    }
}