a.disabled {
  background: linear-gradient(135deg, #555, #333);
  color: rgba(255,255,255,0.5);
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
}

a.disabled small {
  font-size: 0.8em;
  display: block;
  margin-top: 5px;
  opacity: 0.7;
}