.mod-scrollTop{
    width:44px;
    height:44px;
    position:fixed;
    bottom:60px;
    right:10px;
    z-index:999;
    background: rgba(0,0,0,0.6);
    border-radius: 10px;
    i{
        display: block;
        width: 100%;
        line-height: 44px;
        color: #fff;
        text-align: center;
    }
}
.mod-scrollTop{
    width:44px;
    height:44px;
    background:url('../img/top_ico.png');
    background-size:contain;
    position:fixed;
    border-radius: 10px;
    bottom:12px;
    right:10px;
    z-index:999;
}