Index: sources/gui/qml/components/HeaderBarPopup.qml
===================================================================
diff -u -rb147501e55e730aaa2c999e0d20f7363ab3ba6ba -r17a71bb26f714be5f8eaa3346313a5796cbc3b3a
--- sources/gui/qml/components/HeaderBarPopup.qml	(.../HeaderBarPopup.qml)	(revision b147501e55e730aaa2c999e0d20f7363ab3ba6ba)
+++ sources/gui/qml/components/HeaderBarPopup.qml	(.../HeaderBarPopup.qml)	(revision 17a71bb26f714be5f8eaa3346313a5796cbc3b3a)
@@ -11,4 +11,5 @@
     closePolicy         : Dialog.CloseOnPressOutside
     y                   : Variables.headerHeight + 5
     backgroundColor     : "#D2D6DB"
+    showDropShadow      : true
 }
Index: sources/gui/qml/components/ModalDialog.qml
===================================================================
diff -u -r3bee9f20350882eca47f3d18b0accf5bec3933d4 -r17a71bb26f714be5f8eaa3346313a5796cbc3b3a
--- sources/gui/qml/components/ModalDialog.qml	(.../ModalDialog.qml)	(revision 3bee9f20350882eca47f3d18b0accf5bec3933d4)
+++ sources/gui/qml/components/ModalDialog.qml	(.../ModalDialog.qml)	(revision 17a71bb26f714be5f8eaa3346313a5796cbc3b3a)
@@ -16,6 +16,7 @@
 // Qt
 import QtQuick 2.12
 import QtQuick.Controls 2.12 // Dialog
+import QtGraphicalEffects 1.12
 
 // Project
 //  Qml imports
@@ -35,6 +36,7 @@
     property alias  radius              : _backgroundRect.radius
     property alias  notificationText    : _notification.text
     property alias  notification        : _notification
+    property bool   showDropShadow      : false
 
     width   : Variables.dialogWidth
     height  : Variables.dialogHeight
@@ -60,6 +62,18 @@
     background: Rectangle { id: _backgroundRect
         color : Colors.backgroundDialog
         radius: Variables.dialogRadius
+
+        layer.enabled: showDropShadow
+        layer.effect: DropShadow {
+            id: _dropShadow
+            horizontalOffset: 3
+            verticalOffset: 3
+            radius: 3.0
+            samples: 7
+            color: "#50000000"
+            source: _backgroundRect
+            anchors.fill: _backgroundRect
+        }
     }
 
     onVisibleChanged: {