Colors.swift

        ScrollView {
            Group {
                Rectangle().fill(Color(UIColor.systemRed)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.systemBackground)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.secondarySystemBackground)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.tertiarySystemBackground)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.systemFill)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.secondarySystemFill)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.tertiarySystemFill)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.quaternarySystemFill)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.systemRed)).frame(width: 100, height: 100)
            }
            Group {
                Rectangle().fill(Color(UIColor.systemBlue)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.label)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.secondaryLabel)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.tertiaryLabel)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.quaternaryLabel)).frame(width: 100, height: 100)
                Rectangle().fill(Color(UIColor.systemBlue)).frame(width: 100, height: 100)
            }
        }