Edit in JSFiddle

<div class="stage">
  <figure class="ball"></figure>
</div>

@keyframes slide {
  0% {
    left: 0;
    top: 0;
  }
  50% {
    left: 244px;
    top: 100px;
  }
  100% {
    left: 488px;
    top: 0;
  }
}
.stage {
  background: #eaeaed;
  border-radius: 6px;
  height: 150px;
  position: relative;
  min-width: 538px;
}
.stage:hover .ball {
  animation-name: slide;
  animation-duration: 2s;
  animation-timing-function: ease;
  animation-delay: .5s;
}
.ball {
  background: #2db34a;
  border-radius: 50%;
  height: 50px;
  position: absolute;
  width: 50px;
}
figure {
  margin: 0;
}