.game-background {
    width: 100%;
    height: 100%;
    object-fit: cover; /* fill/stretch nicely */
    position: fixed; /* optional: keep it in place */
    top: 0;
    left: 0;
    z-index: -1; /* behind other content */
    opacity: 0.3;
  }

/* Hide page background image when mobile burger menu is open */
@media screen and (max-width: 800px) {
  body.menu-open .game-background {
    display: none;
  }
}