#back-to-top {
    background-color: #8bcc99;
    bottom: 10px;
    box-shadow: 0 0 6px #72a072;
    padding: 5px 10px;
    position: fixed;
    right: 50px;
    border-radius: 8px;
    opacity: 0.7;
}
#back-to-top a{
    text-decoration:none;
}
#back-to-top a:link, #back-to-top a:visited{
    color: white;
}