.back-to-top {
    background: none;
    margin: 0;
    position: fixed;
    /* Fixed/sticky position */
    bottom: 0px;
    /* Place the button at the bottom of the page */
    right: 0px;
    /* Place the button 0px from the right */
    width: 70px;
    height: 70px;
    z-index: 100;
    /* Make sure it does not overlap */
    display: none;
    /* Hidden by default */
    color: white;
    /* Text color */
    background-color: none;
    /* Set a background color */
    border: none;
    /* Remove borders */
    outline: none;
    /* Remove outline */
    cursor: pointer;
    /* Add a mouse pointer on hover */
    padding: 15px;
    /* Some padding */
    border-radius: 10px;
    /* Rounded corners */
    font-size: 18px;
    /* Increase font size */
}

.back-to-top i {
    font-size: 60px;
}

.back-to-top:hover {
    background-color: #555;
    /* Add a dark-grey background on hover */
}