Ios swift – My card background color exceeds the screen

The background color set at the top of my third card and the bottom of my ninth card in the preview screen exceeds the border of the card（I am listening the CS193P）

here is my code

import SwiftUI

struct CardView: View {
    
    let cardShape: CardViewShape
    let color: Color
    let elementsNum: Int
    let fillingMethod: FillingMethod
    
    
    var body: some View {
        GeometryReader { geometry in
            VStack(alignment: .center, spacing: 5) {
                Spacer()
                ForEach(1..<elementsNum+1, id:.self) {index in
                    cardView(for: cardShape, in: geometry)
                }
                Spacer()
            }
            .frame(width: geometry.size.width)
            .border(Color.orange, width: 5)
            .background(Color.green)
        }
        .aspectRatio(2/3, contentMode: .fit)
    }
    
    @ViewBuilder
    private func cardView(for cardShape: CardViewShape, in geometry: GeometryProxy) -> some View {
        switch (cardShape) {
        case .circle:
            let width = min(geometry.size.width, geometry.size.height/CGFloat(elementsNum)) - 10
            Circle()
                .fill(mode: fillingMethod, color: color)
                .frame(maxWidth: width)
        case .rectangle:
            let width = geometry.size.width * 0.65
            let height = geometry.size.height / 5
            Rectangle()
                .fill(mode: fillingMethod, color: color)
                .frame(width: width, height: height)
        case .diamond:
            Diamond()
                .fill(mode: fillingMethod, color: color)
        }
    }
}