#goTopBtn {
    z-index: 9;
    right: 50px;
    bottom: 50px;
    width: 50px;
    height: 50px;
    padding: 0;
    border-radius: 25px;
    line-height: 50px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    -webkit-transition: width .15s ease-out;
    transition: width .15s ease-out;
    position: fixed;
    cursor: pointer;
    font-weight: 500;
    overflow: hidden;
    text-decoration: none;
    background: url('../../images/toTop.png') no-repeat #8792a8;
    background-size: 28px;
    background-position: 11px center;
    outline: none;
    display: none;
}
#goTopBtn span{
    color: #fff;
    display: none;
}
#goTopBtn:hover {
    width: 146px;
    background-position: 20px center;
}
#goTopBtn:hover span{
    display: inline;
    padding-left: 38px;
}