update

src/_sass/gtk/apps/_budgie.scss

@@ -664,7 +664,7 @@ $pos_list: ((top, bottom), (bottom, top), (left, right), (right, left));
     border-style: solid none;
     border-width: 1px;
     border-color: $divider;
-    background-color: transparent;
+    background-color: $base;
 
     // &.middle { border-bottom-style: none; } // applet background between two headers
 
@@ -691,6 +691,8 @@ $pos_list: ((top, bottom), (bottom, top), (left, right), (right, left));
       margin-bottom: 4px;
     }
 
+    list { background: none; }
+
     list.devices-list.sound-devices {
       > row.activatable {
         &:selected, &:checked {

src/gtk/3.0/gtk-Compact.css

@@ -7745,7 +7745,7 @@ frame.raven-frame > border {
   border-style: solid none;
   border-width: 1px;
   border-color: rgba(0, 0, 0, 0.12);
-  background-color: transparent;
+  background-color: #FFFFFF;
 }
 
 .raven .raven-background > overlay > widget > image {
@@ -7775,6 +7775,10 @@ frame.raven-frame > border {
   margin-bottom: 4px;
 }
 
+.raven .audio-widget list {
+  background: none;
+}
+
 .raven .audio-widget list.devices-list.sound-devices > row.activatable:selected, .raven .audio-widget list.devices-list.sound-devices > row.activatable:checked {
   background-color: rgba(0, 0, 0, 0.06);
   color: rgba(0, 0, 0, 0.87);

src/gtk/3.0/gtk-Dark-Compact.css

@@ -7741,7 +7741,7 @@ frame.raven-frame > border {
   border-style: solid none;
   border-width: 1px;
   border-color: rgba(255, 255, 255, 0.12);
-  background-color: transparent;
+  background-color: #2C2C2C;
 }
 
 .raven .raven-background > overlay > widget > image {
@@ -7771,6 +7771,10 @@ frame.raven-frame > border {
   margin-bottom: 4px;
 }
 
+.raven .audio-widget list {
+  background: none;
+}
+
 .raven .audio-widget list.devices-list.sound-devices > row.activatable:selected, .raven .audio-widget list.devices-list.sound-devices > row.activatable:checked {
   background-color: rgba(255, 255, 255, 0.06);
   color: white;

src/gtk/3.0/gtk-Dark.css

@@ -7741,7 +7741,7 @@ frame.raven-frame > border {
   border-style: solid none;
   border-width: 1px;
   border-color: rgba(255, 255, 255, 0.12);
-  background-color: transparent;
+  background-color: #2C2C2C;
 }
 
 .raven .raven-background > overlay > widget > image {
@@ -7771,6 +7771,10 @@ frame.raven-frame > border {
   margin-bottom: 4px;
 }
 
+.raven .audio-widget list {
+  background: none;
+}
+
 .raven .audio-widget list.devices-list.sound-devices > row.activatable:selected, .raven .audio-widget list.devices-list.sound-devices > row.activatable:checked {
   background-color: rgba(255, 255, 255, 0.06);
   color: white;

src/gtk/3.0/gtk-Light-Compact.css

@@ -7744,7 +7744,7 @@ frame.raven-frame > border {
   border-style: solid none;
   border-width: 1px;
   border-color: rgba(0, 0, 0, 0.12);
-  background-color: transparent;
+  background-color: #FFFFFF;
 }
 
 .raven .raven-background > overlay > widget > image {
@@ -7774,6 +7774,10 @@ frame.raven-frame > border {
   margin-bottom: 4px;
 }
 
+.raven .audio-widget list {
+  background: none;
+}
+
 .raven .audio-widget list.devices-list.sound-devices > row.activatable:selected, .raven .audio-widget list.devices-list.sound-devices > row.activatable:checked {
   background-color: rgba(0, 0, 0, 0.06);
   color: rgba(0, 0, 0, 0.87);

src/gtk/3.0/gtk-Light.css

@@ -7744,7 +7744,7 @@ frame.raven-frame > border {
   border-style: solid none;
   border-width: 1px;
   border-color: rgba(0, 0, 0, 0.12);
-  background-color: transparent;
+  background-color: #FFFFFF;
 }
 
 .raven .raven-background > overlay > widget > image {
@@ -7774,6 +7774,10 @@ frame.raven-frame > border {
   margin-bottom: 4px;
 }
 
+.raven .audio-widget list {
+  background: none;
+}
+
 .raven .audio-widget list.devices-list.sound-devices > row.activatable:selected, .raven .audio-widget list.devices-list.sound-devices > row.activatable:checked {
   background-color: rgba(0, 0, 0, 0.06);
   color: rgba(0, 0, 0, 0.87);

src/gtk/3.0/gtk.css

@@ -7745,7 +7745,7 @@ frame.raven-frame > border {
   border-style: solid none;
   border-width: 1px;
   border-color: rgba(0, 0, 0, 0.12);
-  background-color: transparent;
+  background-color: #FFFFFF;
 }
 
 .raven .raven-background > overlay > widget > image {
@@ -7775,6 +7775,10 @@ frame.raven-frame > border {
   margin-bottom: 4px;
 }
 
+.raven .audio-widget list {
+  background: none;
+}
+
 .raven .audio-widget list.devices-list.sound-devices > row.activatable:selected, .raven .audio-widget list.devices-list.sound-devices > row.activatable:checked {
   background-color: rgba(0, 0, 0, 0.06);
   color: rgba(0, 0, 0, 0.87);