html, body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
}
body {
    background-image: url('img/escudo.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed; /* opcional */
}
td {
    color: rgb(9, 13, 240);
}