diff --git a/plugins/ImageReader/ConfigUI.qml b/plugins/ImageReader/ConfigUI.qml
index 893f8e248c..65374702ab 100644
--- a/plugins/ImageReader/ConfigUI.qml
+++ b/plugins/ImageReader/ConfigUI.qml
@@ -156,11 +156,10 @@ UM.Dialog
                     anchors.verticalCenter: parent.verticalCenter
                 }
 
-                Rectangle {
+                Item {
                     width: 180
                     height: 20
-                    Layout.fillWidth:true
-                    color: "transparent"
+                    Layout.fillWidth: true
 
                     Slider {
                         id: smoothing
diff --git a/plugins/LayerView/LayerView.qml b/plugins/LayerView/LayerView.qml
index fef0c52c12..82728d2a1e 100644
--- a/plugins/LayerView/LayerView.qml
+++ b/plugins/LayerView/LayerView.qml
@@ -41,8 +41,9 @@ Item
             width: valueLabel.width + UM.Theme.getSize("default_margin").width
             Behavior on height { NumberAnimation { duration: 50; } }
 
-            border.width: UM.Theme.getSize("default_lining").width;
-            border.color: UM.Theme.getColor("slider_groove_border");
+            border.width: UM.Theme.getSize("default_lining").width
+            border.color: UM.Theme.getColor("slider_groove_border")
+            color: UM.Theme.getColor("tool_panel_background")
 
             visible: UM.LayerView.getLayerActivity && Printer.getPlatformActivity ? true : false
 
diff --git a/resources/qml/AddMachineDialog.qml b/resources/qml/AddMachineDialog.qml
index 8a97a23bb3..756badc4d2 100644
--- a/resources/qml/AddMachineDialog.qml
+++ b/resources/qml/AddMachineDialog.qml
@@ -74,10 +74,8 @@ UM.Dialog
                 width: machineList.width
                 style: ButtonStyle
                 {
-                    background: Rectangle
+                    background: Item
                     {
-                        border.width: 0
-                        color: "transparent";
                         height: UM.Theme.getSize("standard_list_lineheight").height
                         width: machineList.width
                     }
diff --git a/resources/qml/JobSpecs.qml b/resources/qml/JobSpecs.qml
index 00d22ae8a8..70c306f1bc 100644
--- a/resources/qml/JobSpecs.qml
+++ b/resources/qml/JobSpecs.qml
@@ -9,7 +9,7 @@ import QtQuick.Layouts 1.1
 import UM 1.1 as UM
 import Cura 1.0 as Cura
 
-Rectangle {
+Item {
     id: base
 
     property bool activity: Printer.getPlatformActivity
@@ -29,7 +29,6 @@ Rectangle {
     property variant printMaterialCosts: PrintInformation.materialCosts
 
     height: childrenRect.height
-    color: "transparent"
 
     Connections
     {
@@ -84,9 +83,8 @@ Rectangle {
                 }
                 style: ButtonStyle
                 {
-                    background: Rectangle
+                    background: Item
                     {
-                        color: "transparent"
                         UM.RecolorImage
                         {
                             width: UM.Theme.getSize("save_button_specs_icons").width;
diff --git a/resources/qml/Legend.qml b/resources/qml/Legend.qml
index 353747ef67..94eeb1e903 100644
--- a/resources/qml/Legend.qml
+++ b/resources/qml/Legend.qml
@@ -9,14 +9,13 @@ import QtQuick.Layouts 1.1
 import UM 1.1 as UM
 import Cura 1.0 as Cura
 
-Rectangle {
+Item {
     id: base
 
     UM.I18nCatalog { id: catalog; name:"cura"}
 
     width: childrenRect.width
     height: childrenRect.height
-    color: "transparent"
 
     Connections
     {
diff --git a/resources/qml/MonitorButton.qml b/resources/qml/MonitorButton.qml
index 4a68e532d1..1b8f36b264 100644
--- a/resources/qml/MonitorButton.qml
+++ b/resources/qml/MonitorButton.qml
@@ -10,7 +10,7 @@ import QtQuick.Layouts 1.1
 import UM 1.1 as UM
 import Cura 1.0 as Cura
 
-Rectangle
+Item
 {
     id: base;
     UM.I18nCatalog { id: catalog; name:"cura"}
@@ -20,7 +20,6 @@ Rectangle
     property real progress: printerConnected ? Cura.MachineManager.printerOutputDevices[0].progress : 0
     property int backendState: UM.Backend.state
 
-
     property bool showProgress: {
         // determine if we need to show the progress bar + percentage
         if(!printerConnected || !printerAcceptsCommands) {
diff --git a/resources/qml/SaveButton.qml b/resources/qml/SaveButton.qml
index 323123e9a7..2b435aad1b 100644
--- a/resources/qml/SaveButton.qml
+++ b/resources/qml/SaveButton.qml
@@ -8,7 +8,7 @@ import QtQuick.Layouts 1.1
 
 import UM 1.1 as UM
 
-Rectangle {
+Item {
     id: base;
     UM.I18nCatalog { id: catalog; name:"cura"}
 
@@ -53,7 +53,7 @@ Rectangle {
         text: statusText;
     }
 
-    Rectangle{
+    Rectangle {
         id: progressBar
         width: parent.width - 2 * UM.Theme.getSize("default_margin").width
         height: UM.Theme.getSize("progressbar").height
@@ -64,7 +64,7 @@ Rectangle {
         radius: UM.Theme.getSize("progressbar_radius").width
         color: UM.Theme.getColor("progressbar_background")
 
-        Rectangle{
+        Rectangle {
             width: Math.max(parent.width * base.progress)
             height: parent.height
             color: UM.Theme.getColor("progressbar_control")
@@ -73,7 +73,7 @@ Rectangle {
         }
     }
 
-    Rectangle{
+    Item {
         id: saveRow
         width: base.width
         height: saveToButton.height
diff --git a/resources/qml/Settings/SettingItem.qml b/resources/qml/Settings/SettingItem.qml
index 7b50809baa..65e8b7e1c1 100644
--- a/resources/qml/Settings/SettingItem.qml
+++ b/resources/qml/Settings/SettingItem.qml
@@ -145,8 +145,6 @@ Item {
                 height: parent.height;
                 width: height;
 
-                backgroundColor: UM.Theme.getColor("setting_control");
-                hoverBackgroundColor: UM.Theme.getColor("setting_control")
                 color: UM.Theme.getColor("setting_control_button")
                 hoverColor: UM.Theme.getColor("setting_control_button")
 
@@ -173,8 +171,6 @@ Item {
                 height: parent.height;
                 width: height;
 
-                backgroundColor: UM.Theme.getColor("setting_control");
-                hoverBackgroundColor: UM.Theme.getColor("setting_control_highlight")
                 color: UM.Theme.getColor("setting_control_button")
                 hoverColor: UM.Theme.getColor("setting_control_button_hover")
 
@@ -278,8 +274,6 @@ Item {
                     }
                 }
 
-                backgroundColor: UM.Theme.getColor("setting_control");
-                hoverBackgroundColor: UM.Theme.getColor("setting_control_highlight")
                 color: UM.Theme.getColor("setting_control_button")
                 hoverColor: UM.Theme.getColor("setting_control_button_hover")
 
diff --git a/resources/qml/SidebarHeader.qml b/resources/qml/SidebarHeader.qml
index 3a87d51dcf..93d4e9d6f2 100644
--- a/resources/qml/SidebarHeader.qml
+++ b/resources/qml/SidebarHeader.qml
@@ -201,7 +201,7 @@ Column
             color: UM.Theme.getColor("text");
         }
 
-        Rectangle
+        Item
         {
             anchors.verticalCenter: parent.verticalCenter
 
diff --git a/resources/qml/SidebarSimple.qml b/resources/qml/SidebarSimple.qml
index e40e114e0e..61cc23d403 100644
--- a/resources/qml/SidebarSimple.qml
+++ b/resources/qml/SidebarSimple.qml
@@ -25,7 +25,7 @@ Item
     Component.onDestruction: PrintInformation.enabled = false
     UM.I18nCatalog { id: catalog; name:"cura"}
 
-    Rectangle
+    Item
     {
         id: infillCellLeft
         anchors.top: parent.top
@@ -216,7 +216,7 @@ Item
         }
     }
 
-    Rectangle
+    Item
     {
         id: helpersCell
         anchors.top: infillCellRight.bottom
@@ -461,7 +461,7 @@ Item
         supportExtruderCombobox.updateCurrentColor();
     }
 
-    Rectangle
+    Item
     {
         id: tipsCell
         anchors.top: helpersCell.bottom