.z-index-3{
  z-index: 3;
}

.custom-images-style-1 .img-group{
  position: relative;
  text-align: center;
  padding: 80px;
}
.custom-images-style-1 .img-group-inner{
  position: relative;
}
.custom-images-style-1 .img-group-inner span{
  position: absolute;
  top: -10px;
  right: -10px;
  width: 20px;
  height: 20px;
  background-color: #9ecf36;
}
.custom-images-style-1 .img-group-inner span + span{
  top: auto;
  right: auto;
  left: -10px;
  bottom: -10px;
  background-color: #fff;
}
.custom-images-style-1 .img-group img:nth-child(2){
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
}
.custom-images-style-1 .img-group img:nth-child(3){
  position: absolute;
  bottom: 0;
  right: 0;
  z-index: -1;
}
/* style 2 */
.custom-images-style-2 .img-group-2 {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}
.custom-images-style-2 .img-group-2 img + img {
    margin-left: auto;
    margin-top: -50%;
}
@media(max-width: 400px) {
  .custom-images-style-1 .img-group img:nth-child(2),
  .custom-images-style-1 .img-group img:nth-child(3) {
    display: none;
  }
  .custom-images-style-1 .img-group{
    padding: 0;
  }
}