@keyframes fade_in_out {
  0% { opacity: 0;}
  50% { opacity: 1;}
  100% { opacity: 0;}
}
@keyframes rotate {
  0% { transform: rotate(0deg);}
  100% { transform: rotate(360deg);}
}
@keyframes pulse {
  0% { transform: scale(1.1); opacity: 0.75;}
  50% { transform:scale(0.8); opacity: 1;}
  100% { transform: scale(1.1); opacity: 0.75;}
}
@keyframes rotate_pulse {
  0% { transform: rotate(0deg) scale(1.05); opacity: 0.75;}
  50% { transform: rotate(180deg) scale(0.9); opacity: 1;}
  100% { transform: rotate(360deg) scale(1.05); opacity: 0.75;}
}
@keyframes rotate_pulse_ccw {
  0% { transform: rotate(0deg) scale(1.05); opacity: 0.75;}
  50% { transform: rotate(-180deg) scale(0.9); opacity: 1;}
  100% { transform: rotate(-360deg) scale(1.05); opacity: 0.75;}
}