body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: url('https://ormefresche.li/footprints-pamela-hallam.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;    
  filter: blur(6px);
  transform: scale(1.04);  /* prevents blur from leaving transparent edges */ */
}