#useless-button {
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(247, 247, 247, 0.8);
  transform: scale(0);
  animation: ripple-animation 0.6s linear;
  pointer-events: none;
  z-index: 10;
}

@keyframes ripple-animation {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

.ripple {
  animation: ripple-animation 0.4s ease-out; 
}