@keyframes spin {
  from { transform: rotate(0); }
  to { transform: rotate(1turn); }
}

@mixin spin {
  animation: spin .8s linear infinite
}

@keyframes fade-in-out {
  0% { opacity: .6;}
  50% { opacity: 1;}
  100% { opacity: .6;}
}

@mixin fade-in-out {
  animation: fade-in-out 1.5s ease-in infinite;
}