body::after {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  content: "";
  background: url("../images/mainpage_images/image.png") center 36vh / auto min(72vh, 820px) no-repeat;
  filter: grayscale(1) sepia(0.08) contrast(0.9);
  opacity: 0.038;
  mix-blend-mode: screen;
}

body > * {
  position: relative;
  z-index: 1;
}

@media (max-width: 760px) {
  body::after {
    background-position: center 34vh;
    background-size: auto min(68vh, 560px);
    opacity: 0.032;
  }
}