.back-to-top {
    background: none;
    margin: 0;
    position: fixed;
    bottom: 0.8em;
    font-size: 3em;
    right: 0.45em;
    width: 1em;
    height: 1em;
    z-index: 100;
    text-decoration: none;
    color: #ffffff;
    transition: all 1s;
    display: inline;
}