diff --git a/data/themes/classic/style.css b/data/themes/classic/style.css
index 522d694ff..2b853395d 100644
--- a/data/themes/classic/style.css
+++ b/data/themes/classic/style.css
@@ -8,7 +8,7 @@ QLabel, QTreeWidget, QListWidget, QGroupBox, QMenuBar {
 }
 
 QMdiArea {
-	background-image: url(resources:background_artwork.png);
+	background-image: url("resources:background_artwork.png");
 }
 
 lmms--gui--Knob {
@@ -205,7 +205,7 @@ lmms--gui--Oscilloscope {
 
 lmms--gui--CPULoadWidget {
 	border: none;
-	background: url(resources:cpuload_bg.png);
+	background: url("resources:cpuload_bg.png");
 	qproperty-stepSize: 4;
 }
 
@@ -322,14 +322,14 @@ QScrollBar::up-arrow:vertical, QScrollBar::down-arrow:vertical {
     height: 5px;
 }
 
-QScrollBar::left-arrow:horizontal { background-image: url(resources:sbarrow_left.png);}
-QScrollBar::right-arrow:horizontal { background-image: url(resources:sbarrow_right.png);}
-QScrollBar::up-arrow:vertical { background-image: url(resources:sbarrow_up.png);}
-QScrollBar::down-arrow:vertical { background-image: url(resources:sbarrow_down.png);}
-QScrollBar::left-arrow:horizontal:disabled { background-image: url(resources:sbarrow_left_d.png);}
-QScrollBar::right-arrow:horizontal:disabled { background-image: url(resources:sbarrow_right_d.png);}
-QScrollBar::up-arrow:vertical:disabled { background-image: url(resources:sbarrow_up_d.png);}
-QScrollBar::down-arrow:vertical:disabled { background-image: url(resources:sbarrow_down_d.png);}
+QScrollBar::left-arrow:horizontal { background-image: url("resources:sbarrow_left.png");}
+QScrollBar::right-arrow:horizontal { background-image: url("resources:sbarrow_right.png");}
+QScrollBar::up-arrow:vertical { background-image: url("resources:sbarrow_up.png");}
+QScrollBar::down-arrow:vertical { background-image: url("resources:sbarrow_down.png");}
+QScrollBar::left-arrow:horizontal:disabled { background-image: url("resources:sbarrow_left_d.png");}
+QScrollBar::right-arrow:horizontal:disabled { background-image: url("resources:sbarrow_right_d.png");}
+QScrollBar::up-arrow:vertical:disabled { background-image: url("resources:sbarrow_up_d.png");}
+QScrollBar::down-arrow:vertical:disabled { background-image: url("resources:sbarrow_down_d.png");}
 
 /* background for song editor and pattern editor */
 
@@ -367,7 +367,7 @@ lmms--gui--TrackOperationsWidget > QPushButton {
 }
 
 lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator {
-	image: url(resources:trackop.png);
+	image: url("resources:trackop.png");
 	subcontrol-origin: padding;
 	subcontrol-position: center;
 	position: relative;
@@ -375,12 +375,12 @@ lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator {
 }
 
 lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator:hover {
-	image: url(resources:trackop_h.png);
+	image: url("resources:trackop_h.png");
 }
 
 lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator:pressed,
 lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator:checked {
-	image: url(resources:trackop_c.png);
+	image: url("resources:trackop_c.png");
 	position: relative;
 	top: 2px;
 }
@@ -409,7 +409,7 @@ lmms--gui--AutomatableSlider::groove:vertical {
 
 lmms--gui--AutomatableSlider::handle:vertical {
 	background: none;
-	border-image: url(resources:main_slider.png);
+	border-image: url("resources:main_slider.png");
 	width: 26px;
 	height: 10px;
 	border-radius: 2px;
@@ -428,7 +428,7 @@ lmms--gui--AutomatableSlider::groove:horizontal {
 
 lmms--gui--AutomatableSlider::handle:horizontal {
 	background: none;
-	border-image: url(resources:horizontal_slider.png);
+	border-image: url("resources:horizontal_slider.png");
 	width: 10px;
 	height: 26px;
 	border-radius: 2px;
diff --git a/data/themes/default/style.css b/data/themes/default/style.css
index 26b2dd14b..9cbf5885b 100644
--- a/data/themes/default/style.css
+++ b/data/themes/default/style.css
@@ -9,6 +9,7 @@ QLabel, QTreeWidget, QListWidget, QGroupBox, QMenuBar, QCheckBox {
 
 QTreeView {
 	outline: none;
+	alternate-background-color: #111314;
 }
 
 QTreeWidget::item {
@@ -236,7 +237,7 @@ lmms--gui--Oscilloscope {
 
 lmms--gui--CPULoadWidget {
 	border: none;
-	background: url(resources:cpuload_bg.png);
+	background: url("resources:cpuload_bg.png");
 	qproperty-stepSize: 1;
 }
 
@@ -355,16 +356,16 @@ QScrollBar::up-arrow:vertical, QScrollBar::down-arrow:vertical {
 	margin-left: 3px;
 }
 
-QScrollBar::left-arrow:horizontal { background-image: url(resources:sbarrow_left.png);}
-QScrollBar::right-arrow:horizontal { background-image: url(resources:sbarrow_right.png);}
-QScrollBar::up-arrow:vertical { background-image: url(resources:sbarrow_up.png);}
-QScrollBar::down-arrow:vertical { background-image: url(resources:sbarrow_down.png);}
-QScrollBar::left-arrow:horizontal:disabled { background-image: url(resources:sbarrow_left_d.png);}
-QScrollBar::right-arrow:horizontal:disabled { background-image: url(resources:sbarrow_right_d.png);}
-QScrollBar::up-arrow:vertical:disabled { background-image: url(resources:sbarrow_up_d.png);}
-QScrollBar::down-arrow:vertical:disabled { background-image: url(resources:sbarrow_down_d.png);}
-lmms--gui--EffectRackView QScrollBar::up-arrow:vertical:disabled { background-image: url(resources:sbarrow_up.png);}
-lmms--gui--EffectRackView QScrollBar::down-arrow:vertical:disabled { background-image: url(resources:sbarrow_down.png);}
+QScrollBar::left-arrow:horizontal { background-image: url("resources:sbarrow_left.png");}
+QScrollBar::right-arrow:horizontal { background-image: url("resources:sbarrow_right.png");}
+QScrollBar::up-arrow:vertical { background-image: url("resources:sbarrow_up.png");}
+QScrollBar::down-arrow:vertical { background-image: url("resources:sbarrow_down.png");}
+QScrollBar::left-arrow:horizontal:disabled { background-image: url("resources:sbarrow_left_d.png");}
+QScrollBar::right-arrow:horizontal:disabled { background-image: url("resources:sbarrow_right_d.png");}
+QScrollBar::up-arrow:vertical:disabled { background-image: url("resources:sbarrow_up_d.png");}
+QScrollBar::down-arrow:vertical:disabled { background-image: url("resources:sbarrow_down_d.png");}
+lmms--gui--EffectRackView QScrollBar::up-arrow:vertical:disabled { background-image: url("resources:sbarrow_up.png");}
+lmms--gui--EffectRackView QScrollBar::down-arrow:vertical:disabled { background-image: url("resources:sbarrow_down.png");}
 
 /* background for song editor and pattern editor */
 
@@ -401,7 +402,7 @@ lmms--gui--TrackOperationsWidget > QPushButton {
 }
 
 lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator {
-	image: url(resources:trackop.png);
+	image: url("resources:trackop.png");
 	subcontrol-origin: padding;
 	subcontrol-position: center;
 	position: relative;
@@ -410,7 +411,7 @@ lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator {
 
 lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator:pressed,
 lmms--gui--TrackOperationsWidget > QPushButton::menu-indicator:checked {
-	image: url(resources:trackop.png);
+	image: url("resources:trackop.png");
 	position: relative;
 	top: 2px;
 }
@@ -433,7 +434,7 @@ lmms--gui--AutomatableSlider::groove:vertical {
 
 lmms--gui--AutomatableSlider::handle:vertical {
 	background: none;
-	border-image: url(resources:main_slider.png);
+	border-image: url("resources:main_slider.png");
 	width: 26px;
 	height: 10px;
 	border-radius: 2px;
@@ -452,7 +453,7 @@ lmms--gui--AutomatableSlider::groove:horizontal {
 
 lmms--gui--AutomatableSlider::handle:horizontal {
 	background: none;
-	border-image: url(resources:horizontal_slider.png);
+	border-image: url("resources:horizontal_slider.png");
 	width: 10px;
 	height: 26px;
 	border-radius: 2px;
@@ -542,7 +543,7 @@ QToolButton:checked {
 	border-top: 1px solid #1b1f22;
 	border-bottom: 1px solid #4a515e;
 	background: qlineargradient(spread:reflect, x1:0, y1:0, x2:0, y2:1, stop:0 #1b1f22, stop:1 #13161a);
-	background-image: url(resources:shadow_p.png);
+	background-image: url("resources:shadow_p.png");
 }
 
 /* buttons with combined menu */
@@ -591,7 +592,7 @@ lmms--gui--TrackLabelButton:pressed {
 lmms--gui--TrackLabelButton:checked {
 	border: 1px solid #485059;
 	background: #1C1F24;
-	background-image: url(resources:track_shadow_p.png);
+	background-image: url("resources:track_shadow_p.png");
 	border-radius: none;
 	font-size: 11px;
 	font-weight: normal;
@@ -601,7 +602,7 @@ lmms--gui--TrackLabelButton:checked {
 lmms--gui--TrackLabelButton:checked:pressed {
 	border: 1px solid #2f353b;
 	background: #0e1012;
-	background-image: url(resources:track_shadow_p.png);
+	background-image: url("resources:track_shadow_p.png");
 	font-size: 11px;
 	padding: 2px 1px;
 	font-weight: solid;
@@ -718,10 +719,6 @@ lmms--gui--TimeLineWidget {
 	qproperty-barNumberColor: rgb( 192, 192, 192 );
 }
 
-QTreeView {
-	alternate-background-color: #111314;
-}
-
 lmms--gui--TrackContainerView QLabel
 {
 	background: none;