#nachoben {
   opacity: 0.6;
   background: #000;
    color: #FFFFFF;
    display: none;
    padding: 7px 10px 5px;
    position: fixed;

    right: 22px;
    bottom: 22px;

    height: 70px;
    width: 70px;

    text-align: center;
    font-weight: 700;
    line-height: 1.1em;

-webkit-border-radius: 60px;
border-radius: 60px;
font-size: 12px;
z-index: 999;

}

#nachoben:hover {
    text-decoration: none;
   opacity: 1;
}

#nachoben span {
font-size:25px;
}