/* Misty Hills: fog drifts very slowly across the hills. */
.mi-fog {
  animation: mi-drift 40s ease-in-out infinite alternate;
}

.mi-fog2 {
  animation-duration: 55s;
  animation-direction: alternate-reverse;
}

@keyframes mi-drift {
  from { transform: translateX(-40px); }
  to { transform: translateX(40px); }
}