add disabled buttons indication

theme_nin_night/css/style.css

@@ -1387,10 +1387,8 @@ button:hover, .mini-profile-actions span:hover, a.button:hover {
 /* line 85, ../sass/_commons.sass */
 button:disabled, button.disabled, .mini-profile-actions span.disabled, a.button.disabled {
   background-color: #2b2e35;
-}
-/* line 88, ../sass/_commons.sass */
-button:disabled:hover, button.disabled:hover, .mini-profile-actions span.disabled:hover, a.button.disabled:hover {
-  color: white;
+  color: rgba(255, 255, 255, 0.4);
+  cursor: not-allowed
 }
 
 /* line 1, ../sass/_tabs.sass */