CSS实现文字动画炫酷效果

span{//设置文字动画背景动图background:url(/preview/776331/-07-28/asw/img/giphy.gif);//调节图片大小位置background-position-x: 0%;background-position-y: 0%;background-size: auto;background-clip: border-box;background-size: contain;background-position: top left;-webkit-background-clip: text;//设置文字颜色为透明color: transparent;font-size: 21px;font-weight: bold;font-family: sans-serif;position: fixed;z-index: 999;top: 9px;left: 20%;}