fixes unreported bug in styles

ui/settings/mainContent.css

@@ -18,16 +18,6 @@ QListWidget
     background: white;
 }
 
-QScrollArea
-{
-    background: white;
-}
-
-QGroupBox
-{
-    background: white;
-}
-
 QMessageBox
 {
     background: white;
@@ -44,23 +34,6 @@ QSpinBox
     background: white;
 }
 
-QSlider::groove:horizontal
-{
-    border: 1px solid #999999;
-    height: 8px; /* the groove expands to the size of the slider by default. by giving it a height, it has a fixed size */
-    background: white;
-    margin: 2px 0;
-}
-
-QSlider::handle:horizontal
-{
-    background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #b4b4b4, stop:1 #8f8f8f);
-    border: 1px solid #5c5c5c;
-    width: 18px;
-    margin: -2px 0; /* handle is placed by default on the contents rect of the groove. Expand outside the groove */
-    border-radius: 3px;
-}
-
 QPushButton
 {
     background: white;
@@ -71,6 +44,9 @@ QGroupBox
     color: black;
     background-color: white;
     font: @bigBold;
+    border: 2px solid gray;
+    border-radius: 5px;
+    margin-top: 2ex; /* leave space at the top for the title */
 }
 
 QComboBox
@@ -101,10 +77,6 @@ QTabBar
 QScrollArea
 {
     background-color: white;
-}
-
-QScrollArea 
-{ 
     background: transparent; 
 }