body {
  background-image: url('images/IMG_8465\ Large.jpeg'); /* or a full URL */
  background-size: cover;                 /* make it fill the screen */
  background-repeat: no-repeat;           /* prevent tiling */
  background-position: center center;     /* center the image */
  margin: 0;                              /* remove default spacing */
  height: 100vh;                          /* ensure full viewport height */
}