.wp-block-cover.is-style-centaur-cover-diagon {
  position: relative;
}
.wp-block-cover.is-style-centaur-cover-diagon::before {
  position: absolute;
  inset: 0;
  z-index: 1;
  content: "";
  display: block;
  background: url(../../images/bg-diagon.png);
  background-repeat: repeat;
}
.wp-block-cover.is-style-centaur-cover-diagon .wp-block-cover__inner-container {
  z-index: 2 !important;
}