html:after {
  content: "";
  background: url(../images/hero-other.webp),
  url(../images/hero-1ban.webp),
  url(../images/hero-2ban.webp),
  url(../images/hero-other-tablet.webp),
  url(../images/hero-1ban-tablet.webp),
  url(../images/hero-2ban-tablet.webp);
}