#scrollup {    position: fixed;
    bottom: 300px;
    z-index: 300;
    margin-left: 600px;
    right: 164px;
    width: 121px;
    height: 0px;
}
#scrollup a {
    display: block;
    margin-top: 15px;
    background-color: #fff;
    color: #999;
    width: 50px;
    height: 50px;
    line-height: 50px;
    font-family: dzicon;
    font-size: 26px;
    text-align: center;
    box-shadow: 0 0 2px 0 rgb(88 118 138 / 10%);
    border-radius: 4px;
    position: relative;
    background: url(https://boonkiong.com/template/scrollup/img/scroll_up.jpg) no-repeat center center #fff;
    cursor: pointer;
}
#scrollup a.o_light {
     background: url(https://boonkiong.com/template/scrollup/img/o_light.jpg) no-repeat center center #fff;
}
#scrollup a.fast_post {
        background: url(template/scrollup/img/fastpost.jpg) no-repeat center center #fff;
}
#scrollup a:hover{ background: url(https://boonkiong.com/template/scrollup/img/scroll_up.png) no-repeat center center #fff;}
#scrollup a.o_light:hover{ background: url(https://boonkiong.com/template/scrollup/img/o_light.png) no-repeat center center #fff;}
#scrollup a.fast_post:hover{ background: url(https://boonkiong.com/template/scrollup/img/fastpost.png) no-repeat center center #fff;}