console 命令行工具 X clear

console

<div></div>

body{
  background-color:#781A6A;
}

div{
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -75px 0 0 -75px;
  background-image: url("http://minimalmonkey.com/lab/css3-animations/twitter-bird-sprite.png");
  height: 150px;
  width: 150px;
  animation: tweet 0.2s steps(4) infinite;
}

@keyframes tweet{
  100%{
    background-position:-600px 0;
  }
}