.back-to-top {
    position: fixed;
    bottom: 2em;
    right: 2em;
    text-decoration: none;
    background-color: rgba(0, 0, 0, 0.30);
    padding: 1em 1.2em;
    display: none;
    border-radius: 25px;
}

.back-to-top i {
    font-size: 15px;
    color: #fff;
}

.back-to-top, .back-to-top:focus, .back-to-top:hover {
    outline: none;
}