body {
    margin: 0;
    padding: 0;
    background-image: url("images/overpassbg.jpeg"); /* Change path if needed */
    background-size: cover;       /* Makes it cover the whole screen */
    background-repeat: no-repeat; /* Prevents tiling */
    background-position: center;  /* Centers the image */
    height: 100vh;                 /* Full screen height */
}