#page_top {
    position: fixed;
    bottom: 30px;
    right: 20px;
}
#page_top a {
    background-color: rgba(0,0,0,0.5);
	border-radius:20px;
    color: #fff;
    text-align: center;
    text-decoration: none;
    padding: 20px 20px;
}
#page_top a:hover {
    background-color: #666;
    text-decoration: none;
}