.mianff{ position: absolute;
    bottom: -781%;
    left: -90%;
    width: 300%;}
.mianff p{padding:15px 0px; background:#ffffff; font-size:15px; color:#333333; text-align: center; cursor:pointer;}
.mianff p:hover{background:#007AFF;color:#ffffff;}

#nav a{cursor:pointer;}
#nav a:nth-child(2){ background:url("../../img/jiantou.png")no-repeat right 18px; background-size:12px; margin-right:2px;}