/* 代码整理：织梦鸟特效代码 www.soudm.cn */
body{
  margin: 0;
  padding: 0;
  background: #272822;
}

canvas{
  position: absolute;
  top: calc(50% - 50px);
  top: -webkit-calc(50% - 100px);
  left: calc(50% - 200px);
  left: -webkit-calc(50% - 200px);
}