html:after {
  content: "";
  background-image:url(../images/heading-top.webp),
  url(../images/heading-btm.webp),
  url(../images/heading-top-tablet.webp),
  url(../images/heading-btm-tablet.webp),
  url(../images/btn-light.webp),
  url(../images/btn-light-tablet.webp);
}