body {
    background-image: url(bck.png);
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    vertical-align: middle;
    text-align: center;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 10vw;
}