html, body {
  height: 100%;
  margin: 0;
  position: relative;
  background: #222;
}

#wrap {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.ball {
  pointer-events: none;
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: gray;
  animation: implode 1s ease-in-out;
  animation-fill-mode: both;
  opacity: 0.5;
}

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