body {
    margin: 0;
    background-image: url("../img/2152340_m.jpg");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.center-box {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}
.message {
    font-size: 14px;
    font-weight: normal;
    margin-top: 10px;
}