.custom-image .group-block:nth-child(2) {
  position: relative;
}
.custom-image .group-block:nth-child(2)::before {
  content: "";
  display: block;
  position: absolute;
  height: 70%;
  width: calc(100% + 100px);
  left: -50px;
  top: 0;
  background: #EEEADF;
}