#message_div {
    position: fixed;
    text-align: center;
    z-index: 9999999;
    background-color: #5cb85c;
    border-radius: 50px;
    width: 100px;
    height: 45px;
    max-height: 0px;
    max-width: 100px;
    opacity: 0;
    overflow: hidden;
}
#message {
    margin: 0 auto;
    text-align: center;
    color: white;
    font-size: 16px;
}