.btm-zan {width: 30%;text-align: center;}
.btm-zan .zan {background: url(../img/zan.png) center no-repeat;background-size: 25px;/*width: 25px;*/height: 30px;margin: 0 auto;display: block;}
.btm-zan .hover {background: url(../img/yizan.png) center no-repeat;background-size: 50px;width: 50px;height: 50px;margin: 0 auto;display: block;}
.btm-zan .zan span {color: #fff;/*margin-top: 55px;*/display: inline-block;}