/* 返回顶部 */
button#go-up i {
    display: none !important;
}

button#go-up span {
    display: block !important;
    font-weight: bold;
    font-size: 15px !important;
    margin-right: -1px;
}

/* 鼠标滑动到按钮上时显示返回顶部图标 */
button#go-up:hover i {
    display: block !important;
}

button#go-up:hover span {
    display: none !important;
}