diff --git a/src/blackgui/guiutility.cpp b/src/blackgui/guiutility.cpp
index d6f41ff5b..5a6535e48 100644
--- a/src/blackgui/guiutility.cpp
+++ b/src/blackgui/guiutility.cpp
@@ -372,7 +372,7 @@ namespace BlackGui
         BLACK_VERIFY_X(checkBox, Q_FUNC_INFO, "no checkbox");
         if (!checkBox) { return; }
 
-        static const QString background("background: rgba(40,40,40)"); //! \fixme hardcoded stylesheet setting, should come from stylesheet
+        static const QString background("background: rgb(40,40,40)"); //! \fixme hardcoded stylesheet setting, should come from stylesheet
         if (readOnly)
         {
             checkBox->setAttribute(Qt::WA_TransparentForMouseEvents);
diff --git a/src/blackgui/share/qss/stdwidget.qss b/src/blackgui/share/qss/stdwidget.qss
index f915b497e..eae7dfca5 100644
--- a/src/blackgui/share/qss/stdwidget.qss
+++ b/src/blackgui/share/qss/stdwidget.qss
@@ -24,7 +24,7 @@ QCheckBox {
 
 /* CGuiUtility::checkBoxReadOnly */
 /* used for read-only checkboxes */
-/* QCheckBox[readOnly="true"] { background: rgba(40,40,40); } */
+/* QCheckBox[readOnly="true"] { background: rgb(40,40,40); } */
 
 QCheckBox::indicator {
   color: #b1b1b1;
@@ -327,13 +327,13 @@ QLineEdit {
 }
 
 QLineEdit[readOnly="true"] {
-  background: rgba(40,40,40);
-  border: 1px solid rgba(50,50,50);
+  background: rgb(40,40,40);
+  border: 1px solid rgb(50,50,50);
 }
 
 QLineEdit:disabled {
-  background: rgba(40,40,40);
-  border: 1px solid rgba(50,50,50);
+  background: rgb(40,40,40);
+  border: 1px solid rgb(50,50,50);
 }
 
 QLineEdit[validation="error"]   { border: 2px solid red; }
@@ -412,8 +412,8 @@ QComboBox {
 }
 
 QComboBox:disabled {
-  background: rgba(40,40,40);
-  border: 1px solid rgba(50,50,50);
+  background: rgb(40,40,40);
+  border: 1px solid rgb(50,50,50);
 }
 
 /* drop down list */