diff --git a/sidebar/package/contents/ui/CategoriesPage.qml b/sidebar/package/contents/ui/CategoriesPage.qml
--- a/sidebar/package/contents/ui/CategoriesPage.qml
+++ b/sidebar/package/contents/ui/CategoriesPage.qml
@@ -27,7 +27,8 @@
     id: mainColumn
     Component.onCompleted: searchField.forceActiveFocus()
 
-    header: Item {
+    header: Rectangle {
+        color: Kirigami.Theme.backgroundColor
         width: mainColumn.width
         height: Kirigami.Units.gridUnit * 2.5
         RowLayout {
diff --git a/sidebar/package/contents/ui/SubCategoryPage.qml b/sidebar/package/contents/ui/SubCategoryPage.qml
--- a/sidebar/package/contents/ui/SubCategoryPage.qml
+++ b/sidebar/package/contents/ui/SubCategoryPage.qml
@@ -33,9 +33,11 @@
         Accessible.role: Accessible.Button
         Accessible.name: i18n("Back")
 
-        Item {
+        Rectangle {
             id: headerControls
 
+            color: Kirigami.Theme.backgroundColor
+            
             anchors.fill: parent
 
             QtControls.ToolButton {