Enhanced visibility for selected row button

Author: Elbullazul

gtk-3.0/gtk.css

@@ -350,6 +350,8 @@ list {
     list row:selected:backdrop {
       color: #FFFFFF;
       background-color: #000000; }
+    list row:selected button:not(:hover):not(:checked) {
+      color: #FFFFFF; }
 
 .frame, frame > border {
   border-width: 1px;