Port UI to GTK 4

data/gtk.css

@@ -1,8 +1,20 @@
-.bg-texture {
+#content_stack {
     box-shadow:inset 4px 4px 10px rgba(0,0,0,0.3);
     background-image:url('noise-texture.png');
 }
 
+#port_spinner {
+    background:none;
+    margin-top:-13px;
+}
+#port_spinner text {
+    padding-left: 0;
+}
+
+#server_stack_sidebar {
+    background-color:alpha(@theme_bg_color, 1);
+}
+
 .no-bg {
     background:none;
 }
@@ -18,13 +30,13 @@
     font-weight:bold;
 }
 
-revealer.sidebar > * {
+#cover_info_revealer {
     background-color:alpha(@theme_bg_color, 0.8);
     box-shadow:0 0 10px @theme_bg_color;
-    margin-left:20px
+    margin-left:20px;
 }
 
-revealer.sidebar scale mark indicator {
+#cover_info_revealer scale mark indicator {
     margin-right:5px;
 }
 
@@ -53,3 +65,6 @@ iconview.view.selection:selected:focus {
 iconview.view.selection:hover {
     -gtk-icon-effect:none;
 }
+gridview child {
+    padding: 1px;
+}