@import url(https://cdn.jsdelivr.net/gh/moonspam/NanumSquare@1.0/nanumsquare.css);


#top_button {
    background: url(../img/top_button2.png);
    width: 70px;
    height: 70px;
    position: fixed;
    /*right: 300px;*/
    /*bottom: 80px;*/
    right: 2%; bottom: 50px;
    z-index:-1;
    opacity: 0;
    transition: 0.3s;
}


#top_button.on {
    opacity: 1;
    display: block;
    /*opacity: 1;*/
    z-index:9999;
}