html, body {
  height: 100%;
  margin: 0;
}

body {
  background-image: url("splash.png");
  background-size: cover;       /* Scale image to fill the screen */
  background-position: center;  /* Keep image centered */
  background-repeat: no-repeat; /* No tiling */
  background-attachment: fixed; /* Optional: parallax-like effect */
}