Persistent notifications should not fade out

issue #333
- css fix

core/client/assets/sass/modules/global.scss

@@ -871,11 +871,13 @@ nav {
     @include icon($i-success);
     background: $green;
 
+    &.notification-passive {
         @include animation(fade-out 1s linear);
         @include animation-delay(3s);
         @include animation-iteration-count(1);
         @include animation-fill-mode(forwards);
     }
+}
 
 .notification-error {
     @extend %notification;