#myBtn {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: rgba(13, 109, 253, 0.389);
    color: #4b4b4b;
    cursor: pointer;
    border-radius: 4px;
}

#myBtn:hover {
    background-color: #4b4b4b48;
}