/*** 戻るボタン ***/
div#go_back {
    width: 115px;
    height: 30px;
    margin: 10px auto;
}

div#go_back a {
    display:block;
    overflow: hidden;
    width: 100px;
    height: 0;
    margin: 0;
    padding: 30px 0 0 0;
    background-image:url(../img/contents/pc/btn_go_back.png);
    background-repeat:no-repeat;
}

div#go_back a:hover {
    background-position: 0 -30px;
}