Compliance fixes for gtk-3.20, gtk-4.0, and gnome-shell

This commit fixes all immediate errors that would cause `dart-sass` to error out.

gtk-3.20/gtk-dark.css

@@ -445,7 +445,6 @@ button {
   outline-color: rgba(248, 248, 242, 0.3);
   background-color: #282a36;
   text-shadow: none;
-  border: 1px solid #282a36;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 notebook > header > tabs > arrow.flat, notebook > header > tabs > arrow, combobox:drop(active) button.flat.combo, combobox:drop(active) .selection-mode button.combo.titlebutton, .selection-mode combobox:drop(active) button.combo.titlebutton, .selection-mode button.titlebutton,
@@ -826,7 +825,6 @@ button.suggested-action {
   outline-color: rgba(255, 255, 255, 0.3);
   background-color: #bd93f9;
   text-shadow: none;
-  border: 1px solid #bd93f9;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 button.suggested-action.flat,
@@ -1029,7 +1027,6 @@ button.destructive-action {
   outline-color: rgba(255, 255, 255, 0.3);
   background-color: #ff2222;
   text-shadow: none;
-  border: 1px solid #ff2222;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 button.destructive-action.flat,
@@ -1264,7 +1261,6 @@ toolbar button:hover {
   outline-color: rgba(248, 248, 242, 0.3);
   background-color: #0f0f14;
   text-shadow: none;
-  border: 1px solid #0f0f14;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 toolbar button:active {
@@ -1273,7 +1269,6 @@ toolbar button:active {
   outline-color: rgba(248, 248, 242, 0.3);
   background-color: #040406;
   text-shadow: none;
-  border: 1px solid #040406;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 
@@ -2238,7 +2233,6 @@ colorswatch#add-color-button overlay {
   outline-color: rgba(248, 248, 242, 0.3);
   background-color: #282a36;
   text-shadow: none;
-  border: 1px solid #282a36;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 colorswatch#add-color-button overlay:hover {
@@ -3145,7 +3139,6 @@ headerbar .selection-mode button.titlebutton,
   outline-color: rgba(255, 255, 255, 0.3);
   background-color: #72BFD0;
   text-shadow: none;
-  border: 1px solid #72BFD0;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 .titlebar:not(headerbar) button.suggested-action:hover, .titlebar:not(headerbar) .selection-mode button.titlebutton:hover, .selection-mode .titlebar:not(headerbar) button.titlebutton:hover,
@@ -3217,7 +3210,6 @@ headerbar button.destructive-action {
   outline-color: rgba(255, 255, 255, 0.3);
   background-color: #ff2222;
   text-shadow: none;
-  border: 1px solid #ff2222;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 .titlebar:not(headerbar) button.destructive-action:hover,
@@ -3358,7 +3350,6 @@ headerbar.selection-mode button {
   outline-color: rgba(248, 248, 242, 0.3);
   background-color: rgba(189, 147, 249, 0.5);
   text-shadow: none;
-  border: 1px solid rgba(189, 147, 249, 0.5);
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 .selection-mode.titlebar:not(headerbar) button.flat, .selection-mode.titlebar:not(headerbar) button.titlebutton,
@@ -3490,7 +3481,6 @@ headerbar.selection-mode button.titlebutton {
   outline-color: rgba(255, 255, 255, 0.3);
   background-color: #72BFD0;
   text-shadow: none;
-  border: 1px solid #72BFD0;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 .selection-mode.titlebar:not(headerbar) button.suggested-action:hover, .selection-mode.titlebar:not(headerbar) button.titlebutton:hover,
@@ -26041,7 +26031,8 @@ searchbar {
  * Tooltips *
  ************/
 tooltip {
-  padding: 4px; /* not working */
+  padding: 4px;
+  /* not working */
   border-radius: 5px;
   box-shadow: none;
   text-shadow: 0 1px black;
@@ -28672,22 +28663,35 @@ radiobutton.color-button:active > radio {
 /* Unity panel color #454D50 */
 UnityDecoration {
   /* Border properties (top, right, bottom, left) */
-  -UnityDecoration-extents: 28px 1px 1px 1px; /* the size of the decorations  */
-  -UnityDecoration-input-extents: 10px; /* the extra size of the input areas */
+  -UnityDecoration-extents: 28px 1px 1px 1px;
+  /* the size of the decorations  */
+  -UnityDecoration-input-extents: 10px;
+  /* the extra size of the input areas */
   /* Shadows settings */
-  -UnityDecoration-shadow-offset-x: 1px; /* Size property, the shadow x offset */
-  -UnityDecoration-shadow-offset-y: 1px; /* Size property, the shadow y offset */
-  -UnityDecoration-active-shadow-color: rgba 0, 0, 0, 0.647; /* Color property, active window shadow color */
-  -UnityDecoration-active-shadow-radius: 8px; /* Size property, active window shadow radius */
-  -UnityDecoration-inactive-shadow-color: rgba 0, 0, 0, 0.647; /* Color property, inactive windows shadow color */
-  -UnityDecoration-inactive-shadow-radius: 5px; /* Size property, inactive windows shadow radius */
+  -UnityDecoration-shadow-offset-x: 1px;
+  /* Size property, the shadow x offset */
+  -UnityDecoration-shadow-offset-y: 1px;
+  /* Size property, the shadow y offset */
+  -UnityDecoration-active-shadow-color: rgba 0, 0, 0, 0.647;
+  /* Color property, active window shadow color */
+  -UnityDecoration-active-shadow-radius: 8px;
+  /* Size property, active window shadow radius */
+  -UnityDecoration-inactive-shadow-color: rgba 0, 0, 0, 0.647;
+  /* Color property, inactive windows shadow color */
+  -UnityDecoration-inactive-shadow-radius: 5px;
+  /* Size property, inactive windows shadow radius */
   /* Glow applied to the selected scaled window */
-  -UnityDecoration-glow-size: 8px; /* Size property, size of glow */
-  -UnityDecoration-glow-color: rgba(189, 147, 249, 0.5); /* Color property of the glow */
+  -UnityDecoration-glow-size: 8px;
+  /* Size property, size of glow */
+  -UnityDecoration-glow-color: rgba(189, 147, 249, 0.5);
+  /* Color property of the glow */
   /* Title settings */
-  -UnityDecoration-title-indent: 10px; /* Size property, left indent of the title */
-  -UnityDecoration-title-fade: 35px; /* Size property, space of the title that can be faded */
-  -UnityDecoration-title-alignment: 0; /* Float from 0.0 to 1.0, to align the title */
+  -UnityDecoration-title-indent: 10px;
+  /* Size property, left indent of the title */
+  -UnityDecoration-title-fade: 35px;
+  /* Size property, space of the title that can be faded */
+  -UnityDecoration-title-alignment: 0;
+  /* Float from 0.0 to 1.0, to align the title */
   background-color: #31363D;
   color: #fefefe;
 }
@@ -28973,7 +28977,6 @@ ConversationListView iconview .selection-mode.titlebar:not(headerbar) button.cel
   outline-color: rgba(248, 248, 242, 0.3);
   background-color: #282a36;
   text-shadow: none;
-  border: 1px solid #282a36;
   box-shadow: inset 0px 1px 0px 0px rgba(255, 255, 255, 0.1), inset 0px -1px 0px 0px rgba(0, 0, 0, 0.1);
 }
 #content_frame button:hover {
@@ -29080,7 +29083,7 @@ ConversationListView iconview .selection-mode.titlebar:not(headerbar) button.cel
 
 scrolledwindow.sidebar treeview.view, scrollbar.right {
   background: #232530;
-  padding: 6px 1.5px;
+  padding: 1.5px;
   border: none;
   box-shadow: none;
 }
@@ -29098,20 +29101,10 @@ headerbar.selection-mode window.thunar toolbar > toolitem > widget > widget.link
 window.thunar .selection-mode.titlebar:not(headerbar) toolbar > toolitem > widget > widget.linked.path-bar > button.toggle.path-bar-button.subtitle:visited,
 .selection-mode.titlebar:not(headerbar) window.thunar toolbar > toolitem > widget > widget.linked.path-bar > button.toggle.path-bar-button.subtitle:visited, window.thunar paned > scrolledwindow treeview.view:hover, window.thunar paned > scrolledwindow treeview.view:checked, window.thunar paned > scrolledwindow treeview.view:selected,
 window.thunar paned > scrolledwindow headerbar.selection-mode treeview.view.subtitle:link,
-headerbar.selection-mode window.thunar paned > scrolledwindow treeview.view.subtitle:link, window.thunar paned > scrolledwindow .selection-mode.titlebar:not(headerbar) treeview.view.subtitle:link, .selection-mode.titlebar:not(headerbar) window.thunar paned > scrolledwindow treeview.view.subtitle:link, .thunar toolbar.horizontal button:hover, .thunar toolbar.horizontal button:checked, .thunar toolbar.horizontal button:selected,
-.thunar toolbar.horizontal headerbar.selection-mode button.subtitle:link,
-headerbar.selection-mode .thunar toolbar.horizontal button.subtitle:link, .thunar toolbar.horizontal .selection-mode.titlebar:not(headerbar) button.subtitle:link, .selection-mode.titlebar:not(headerbar) .thunar toolbar.horizontal button.subtitle:link,
-.thunar toolbar.horizontal headerbar.selection-mode button.subtitle:visited,
-headerbar.selection-mode .thunar toolbar.horizontal button.subtitle:visited,
-.thunar toolbar.horizontal .selection-mode.titlebar:not(headerbar) button.subtitle:visited,
-.selection-mode.titlebar:not(headerbar) .thunar toolbar.horizontal button.subtitle:visited {
+headerbar.selection-mode window.thunar paned > scrolledwindow treeview.view.subtitle:link, window.thunar paned > scrolledwindow .selection-mode.titlebar:not(headerbar) treeview.view.subtitle:link, .selection-mode.titlebar:not(headerbar) window.thunar paned > scrolledwindow treeview.view.subtitle:link {
+  background-color: transparent;
   color: #bd93f9;
-  background-color: rgba(189, 147, 249, 0.1);
-  border-radius: 7px;
   box-shadow: none;
-  text-shadow: none;
-  font-weight: bold;
-  font-weight: normal;
 }
 window.thunar toolbar > toolitem > widget > widget.linked.path-bar > button.toggle.path-bar-button:checked:backdrop label, window.thunar toolbar > toolitem > widget > widget.linked.path-bar > button.toggle.path-bar-button:selected:backdrop label,
 window.thunar headerbar.selection-mode toolbar > toolitem > widget > widget.linked.path-bar > button.toggle.path-bar-button.subtitle:backdrop:link label,
@@ -29121,13 +29114,7 @@ headerbar.selection-mode window.thunar toolbar > toolitem > widget > widget.link
 window.thunar .selection-mode.titlebar:not(headerbar) toolbar > toolitem > widget > widget.linked.path-bar > button.toggle.path-bar-button.subtitle:backdrop:visited label,
 .selection-mode.titlebar:not(headerbar) window.thunar toolbar > toolitem > widget > widget.linked.path-bar > button.toggle.path-bar-button.subtitle:backdrop:visited label, window.thunar paned > scrolledwindow treeview.view:checked:backdrop label, window.thunar paned > scrolledwindow treeview.view:selected:backdrop label,
 window.thunar paned > scrolledwindow headerbar.selection-mode treeview.view.subtitle:backdrop:link label,
-headerbar.selection-mode window.thunar paned > scrolledwindow treeview.view.subtitle:backdrop:link label, window.thunar paned > scrolledwindow .selection-mode.titlebar:not(headerbar) treeview.view.subtitle:backdrop:link label, .selection-mode.titlebar:not(headerbar) window.thunar paned > scrolledwindow treeview.view.subtitle:backdrop:link label, .thunar toolbar.horizontal button:checked:backdrop label, .thunar toolbar.horizontal button:selected:backdrop label,
-.thunar toolbar.horizontal headerbar.selection-mode button.subtitle:backdrop:link label,
-headerbar.selection-mode .thunar toolbar.horizontal button.subtitle:backdrop:link label, .thunar toolbar.horizontal .selection-mode.titlebar:not(headerbar) button.subtitle:backdrop:link label, .selection-mode.titlebar:not(headerbar) .thunar toolbar.horizontal button.subtitle:backdrop:link label,
-.thunar toolbar.horizontal headerbar.selection-mode button.subtitle:backdrop:visited label,
-headerbar.selection-mode .thunar toolbar.horizontal button.subtitle:backdrop:visited label,
-.thunar toolbar.horizontal .selection-mode.titlebar:not(headerbar) button.subtitle:backdrop:visited label,
-.selection-mode.titlebar:not(headerbar) .thunar toolbar.horizontal button.subtitle:backdrop:visited label {
+headerbar.selection-mode window.thunar paned > scrolledwindow treeview.view.subtitle:backdrop:link label, window.thunar paned > scrolledwindow .selection-mode.titlebar:not(headerbar) treeview.view.subtitle:backdrop:link label, .selection-mode.titlebar:not(headerbar) window.thunar paned > scrolledwindow treeview.view.subtitle:backdrop:link label {
   color: rgba(189, 147, 249, 0.4);
 }