QML, column and lack of top margin

Rectangle {
    width: 180
    height: 64
    color: "#e6efe9"

    Column {
        anchors {
            right: parent.right
            rightMargin: 5
            topMargin: 15
        }
        height: parent.height
        width: 24
        spacing: (height - 2*width)/2
        Button {
            iconSource: "img/play1.png"
            style: ButtonStyle {
                background: Rectangle {
                    width: parent.width
                    implicitHeight: width
                    border.width: control.activeFocus ? 1 : 2
                    border.color: "#c0c9c2"
                    color: "#000000"
                    radius: width * 0.5
                    gradient: Gradient {
                        GradientStop { position: 5 ; color: "#000000" }
                        GradientStop { position: 6 ; color: control.pressed ? "#ccc" : "red" }
                    }
                }
            }
        }
        Button {
            iconSource: "img/iritated.jpg"
            style: ButtonStyle {
                background: Rectangle {
                    implicitWidth: 24
                    implicitHeight: width
                    border.width: control.activeFocus ? 1 : 2
                    border.color: "#c0c9c2"
                    color: "#d7e0da"
                    radius: width * 0.5
                }
            }
        }
    }
}