body {
  position: relative;
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("https://res.cloudinary.com/lastminute-contenthub/s--MhYZpvwO--/c_limit,h_999999,w_1920/f_auto/q_auto:eco/v1/DAM/Photos/Destinations/Europe/UK/Blackpool/shutterstock_451143406");
  background-repeat: no-repeat;
  background-size: cover;
  opacity: 0.3; /* 50% transparent */
  z-index: -1; /* Ensure it is behind other content */
}