#page-top {
    position: fixed;
    bottom: 50px;
    right: 20px;
}
div#site_header  h1 {
    position: relative;
}
div#site_header  h1 a {
    line-height: 80px;
    margin-left: 80px;
    padding-left: 20px;
}
div#site_header h1 a:before {
    position: absolute;
    content: "";
    width: 80px;
    height: 80px;
    background-image: url(https://img.wiki3.jp/kwsbazooka/kawasesan.png);
    display: block;
    background-size:80px 80px;
    top: 0;
}