.ball,
.ball2 {
  pointer-events: none;
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: gray;
  animation: implode 1s ease-in-out;
  animation-fill-mode: both;
}

@keyframes implode {
  100% {
    transform: scale(0);
  }
}