#myBtn {
    width: 60px;
    height: 60px;
    display: none;
    /* Hidden by default */
    position: fixed;
    /* Fixed/sticky position */
    bottom: 30px;
    /* Place the button at the bottom of the page */
    right: 30px;
    /* Place the button 30px from the right */
    z-index: 99;
    /* Make sure it does not overlap */
    border: none;
    /* Remove borders */
    outline: none;
    /* Remove outline */
    background-color: #334460;
    /* Set a background color */
    color: white;
    /* Text color */
    cursor: pointer;
    /* Add a mouse pointer on hover */
    /* Some padding */
    border-radius: 100%;
    /* Rounded corners */
    font-size: 30px;
    text-align: center;
    cursor: pointer;
}

#myBtn:hover {
    background-color: #5c7eb4;
    /* Add a dark-grey background on hover */
}