#t_fixed {
    position: fixed;
    right: 20px;
    bottom: 60px;
    transition: bottom ease .3s;
    z-index: 3;
    font-size: 18px;
    text-align: center;
    line-height: 36px;
}
#t_fixed a.btnn {
    width: 36px;
    height: 36px;
    display: block;
    text-decoration: none;
    color: #999;
    border-radius: 5px;
}