ContentView.swift

import SwiftUI

struct ContentView: View {
    var body: some View {
        ZStack {
            Rectangle()
                .fill(.blue)
                .frame(width: 200,
                       height: 200)
            Rectangle()
                .fill(.red)
                .frame(width: 100,
                       height: 100)
            Rectangle()
                .fill(.green)
                .frame(width: 50,
                       height: 50)
            Spacer()
        }
        .padding(.horizontal, 20)
    }
}