纯CSS3打造来回滚动和碰撞的立体桌球

纯CSS3打造来回滚动和碰撞的立体桌球，碰撞效果符合力学，带有投影效果，没有用到一张图片。不兼容IE8以下内核的浏览器。
1、把下面的CSS样式拷贝到您的html的头部：

<style type="text/css">
body { background: #222; }
.box {
  background-color: #61ab20;
  margin: 0 auto;
  width: 500px;
  height: 300px;
  position: relative;
  box-shadow: inset 0 0 3px #000;
  border-radius: 5px;
  border: 1px solid #111;
  overflow: hidden;
}
.box b {
  display: block;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #3673cf;
  box-shadow: inset -5px -5px 5px rgba(0,0,0,.6), 15px 15px 2px rgba(0,0,0,.04);
  position: absolute;
  -webkit-animation: moveX 3.05s linear 0s infinite alternate, moveY 3.4s linear 0s infinite alternate;
  -moz-animation: moveX 3.05s linear 0s infinite alternate, moveY 3.4s linear 0s infinite alternate;
  -o-animation: moveX 3.05s linear 0s infinite alternate, moveY 3.4s linear 0s infinite alternate;
  animation: moveX 3.05s linear 0s infinite alternate, moveY 3.4s linear 0s infinite alternate;
}
@-webkit-keyframes moveX {
  from { left: 0; } to { left: 480px; }
}
@-moz-keyframes moveX {
  from { left: 0; } to { left: 480px; }
}
@-o-keyframes moveX {
  from { left: 0; } to { left: 480px; }
}
@keyframes moveX {
  from { left: 0; } to { left: 480px; }
}
@-webkit-keyframes moveY {
  from { top: 0; } to { top: 280px; }
}
@-moz-keyframes moveY {
  from { top: 0; } to { top: 280px; }
}
@-o-keyframes moveY {
  from { top: 0; } to { top: 280px; }
}
@keyframes moveY {
  from { top: 0; } to { top: 280px; }
}
</style>

2、把以下代码拷贝到你想引用的地方

<div class="box"><b></b></div>