body {
    margin: 0;
    padding: 0;
    background-image: url('../../1.jpg'); 
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
}

@media (max-width: 768px) {
    body {
        background-image: url('../../2.jpg'); 
    }
}