body {
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("../img/logo.png");
  background-repeat: repeat;
  background-size: 280px;
  opacity: 0.035;
  pointer-events: none;
  z-index: 0;
}

/* Ensure all content stays above watermark */
body > * {
  position: relative;
  z-index: 1;
}