.prepare-ripple {
  overflow: hidden;
  position: relative;
}
.ripple {
  background: rgba(255, 255, 255, .3);
  border-radius: 100%;
  display: block; 
  position: absolute;
  transform: scale(0);
}
.ripple.on-animate {
  animation: ripple .65s linear;
}
@keyframes ripple {
  100% {
    opacity: 0; 
    transform: scale(2.5);
  }
}