#wachat a{position:fixed;z-index:9999;right:17px;float:right;bottom:20%;margin-top:-25px;cursor:pointer;color:#fff;text-align:center;padding:5px;margin:0 auto 0 auto;background:#20b038;-webkit-transition:All .5s ease;-moz-transition:All .5s ease;-o-transition:All .5s ease;-ms-transition:All .5s ease;transition:All .5s ease;border-radius:10px}#wachat a img{width:35px}@media screen and (max-width:768px){#wachat a{bottom:15%;right:17px}#wachat a img{width:25px}}