body {
    background-image: url('./s.jpg'); 
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-color: rgb(3, 0, 65); 
    scroll-behavior: smooth;
    color: rgb(0, 0, 0); 
}
body.dark-mode {
    background-image: none;
    background-color: black; 
    color: #ffffff; 
}