.flash-success {
  animation: flashGreen 1s ease;
}

@keyframes flashGreen {
  0%   { box-shadow: 0 0 0px rgba(0, 255, 0, 0.7); }
  30%  { box-shadow: 0 0 8px rgba(0, 255, 0, 0.9); }
  60%  { box-shadow: 0 0 8px rgba(0, 255, 0, 0.9); }
  100% { box-shadow: 0 0 0px rgba(0, 255, 0, 0); }
}