Warning, /frameworks/kirigami/examples/shadowrectangle.qml is written in an unsupported language. File is not indexed.

 import QtQuick 2.15
 import org.kde.kirigami 2.20 as Kirigami
 
 Rectangle {
         color: "white"
         Kirigami.ShadowedRectangle {
                 anchors.centerIn: parent
 
                 color: "grey"
                 width: parent.width / 1.5
                 height: parent.height / 1.5
                 opacity: .3
                 border.width: Kirigami.Units.smallSpacing * 2
                 border.color: "red"
                 corners.bottomLeftRadius: Kirigami.Units.largeSpacing
                 corners.topRightRadius: Kirigami.Units.largeSpacing * 5
         }
 }