move gtk3 styles for xfce4-notifyd into sass

(cherry picked from commit 7fbc94a)

(cherry picked from commit 00ba709)

gtk-3.0/scss/widgets/_osd.scss

@@ -8,7 +8,8 @@
 @include exports("osd") {
     GtkOverlay.osd { background-color: transparent; }
 
-    .osd {
+    .osd,
+    #XfceNotifyWindow {
         &.background {
             background-color: alpha($osd_bg, .8);
             color: $osd_fg;

gtk-3.20/scss/widgets/_osd.scss

@@ -8,7 +8,8 @@
 @include exports("osd") {
     overlay.osd { background-color: transparent; }
 
-    button.osd {
+    button.osd,
+    #XfceNotifyWindow button {
         @include button($osd_bg, $osd_fg);
 
         &.image-button {
@@ -37,7 +38,8 @@
         &.bottom { border-radius: 0; } // positional classes for `attached` osd toolbars
     }
 
-    .osd {
+    .osd,
+    #XfceNotifyWindow {
         background-color: $osd_bg;
         color: $osd_fg;
 

xfce-notify-4.0/gtk.css

@@ -1,34 +0,0 @@
-#XfceNotifyWindow {
-	background-color: #111111;
-	border-color: #444444;
-	border-radius: 2px;
-	border-width: 1px;
-}
-
-#XfceNotifyWindow:hover {
-	border-color: #333333;
-}
-
-#XfceNotifyWindow label {
-	color: #f9f9f9;
-	-GtkWidget-link-color: #f0544c;
-}
-
-#XfceNotifyWindow label#summary {
-	font-weight: bold;
-}
-
-#XfceNotifyWindow button {
-	background-color: #444444;
-	color: #eeeeee;
-}
-
-#XfceNotifyWindow button:hover {
-	background-color: #555555;
-}
-
-#XfceNotifyWindow button:active {
-	background-color: #444444;
-}
-
-/* TODO: Implement progressbar style */