.block-home-backstages-block {
  position: relative;
}
.block-home-backstages-block:before {
  content: "";
  position: absolute;
  display: block;
  bottom: -20%;
  left: 50%;
  width: 100vw;
  height: 75%;
  z-index: 0;
  background-color: #F6EFE7;
  transform: translateX(-50%);
}