/* od.css */
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

.od {
    background-image: url('../imgs/od.jpg');
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    height: 100vh;
    width: 100%;
}