SemanSemantic-UItic-UI/source/library/classic/elements/notification.css

/*---------------
 UI Notification
----------------*/

.ui.notification.hidden {
  display: none;
}
.ui.notification {
  position: absolute;
  top: 0px;
  right: 0px;

  background-color: #EEEEEE;
  padding: 3px 5px;

  background: -webkit-linear-gradient(top, #FFFFFF 0%, #DDDDDD 100%);
  background: -moz-linear-gradient(top, #FFFFFF 0%, #DDDDDD 100%);
  background: -o-linear-gradient(top, #FFFFFF 0%, #DDDDDD 100%);
  background: -ms-linear-gradient(top, #FFFFFF 0%, #DDDDDD 100%);
  background: linear-gradient(top, #FFFFFF 0%, #DDDDDD 100%);

  border: 1px solid #DDDDDD;

  border-radius: 5px;

  box-shadow:
    1px 1px 1px rgba(0, 0, 0, 0.3),
    0px 1px 0px rgba(255, 255, 255, 0.6) inset
  ;

  font-size: 11px;
  line-height: 1;
  text-transform: uppercase;
  color: #555555;
  z-index: 100;
}