CSS实现小球跳动效果

CSS实现小球跳动效果

<style type="text/css">
   .bound {
  animation-duration: 1s;
}

.ball {
  animation-duration: .75s;
}

.dot {
  animation-duration: .25s;
}

.dot {
  top: 100%;
  height: 50%;
  width: 50%;
  background-color: #fff;
  transform: translate(0, -50%);
  animation-name: drop;
}

.ball {
  top: 100%;
  height: 50%;
  width: 50%;
  transform: translate(0, -50%);
  animation-name: drop, roundround;
}

.bound {
  top: 0;
  animation-name: playalong, roundround;
}

.wrapper {
  position: relative;
  margin: auto;
  width: 100%;
  overflow: hidden;
}

.wrapper:before {
  content: "";
  display: block;
  padding-top: 100%;
}

.bound,
.ball,
.dot {
  position: absolute;
  margin: auto;
  animation-delay: 0;
  animation-direction: alternate;
  animation-iteration-count: infinite;
  animation-timing-function: ease-in-out;
  animation-play-state: running;
  right: 0%;
  bottom: 0%;
  left: 0%;
  border-radius: 50%;
}

body {
  margin: 0;
  background: black;
}

* {
  box-sizing: border-box;
}

@keyframes playalong {
  from {
    height: 100%;
    width: 100%;
  }
  to {
    height: 10%;
    width: 10%;
  }
}

@keyframes roundround {
  to {
    transform: rotate(360deg);
  }
}

@keyframes drop {
  to {
    top: 0%;
    bottom: 80%;
    transform: scale(.25);
  }
}

@media (orientation: landscape) {
  .wrapper {
    width: 100vh;
  }
}
@media (orientation: portrait) {
  .wrapper {
  top: 50%;
  -ms-transform:translateY(-50%);
  -webkit-transform:translateY(-50%);
  -moz-transform:translateY(-50%);
  -o-transform:translateY(-50%);
  transform:translateY(-50%);
  }
  body{
    height:100vh;
  }
}

@-ms-viewport {
  width: device-width;
}

@viewport {
  zoom: 1.0;
  width: device-width;
}
</style>
<div class="wrapper">
  <div class="bound">
    <span class="ball">
            <span class="dot"></span>
    </span>
  </div>
</div>

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