.custom-image-style-1 {
  position: relative;
  border-radius: 100%;
  border: 7px solid #FFF;
  -webkit-box-shadow: 0px 7px 60px -15px rgba(0, 0, 0, 0.5);
          box-shadow: 0px 7px 60px -15px rgba(0, 0, 0, 0.5);
  z-index: 2;
}

  .custom-image-style-1:not(._middle) {
    position: absolute;
    top: 30%;
    z-index: 1;
  }
  .custom-image-style-1._left {
    left: 6%;
    animation-delay: 0.5s;
  }
  .custom-image-style-1._middle { 
    animation-delay: 1.5s;
  }
  .custom-image-style-1._right {
     left: 65%; 
    animation-delay: 2.5s;
  }
@media (min-width: 767px) and (min-width: 992px) and (max-width: 1199px) {
  .custom-image-style-1._left {
    left: 50%;
    width: 15vw;
    top:50%;
  }
  .custom-image-style-1._middle{
    width: 23vw;
  }
  .custom-image-style-1._right{
    left: 85%;
    width: 15vw;
    top:50%;
  }
}

@media (min-width: 320px) and (max-width: 767px) {
  .custom-image-style-1._left, .custom-image-style-1._right {
    width: 30vw;
  }
  .custom-image-style-1._middle {
    width: 40vw;
  }
  .custom-image-style-1{
    border:solid 5px #fff;
  }
  .col-lg-6.about-img{
    margin: 10% auto;
  }
}

@media (min-width: 1450px) {
  .custom-image-style-1._left, .custom-image-style-1._right {
    width: 12vw;
  }
  .custom-image-style-1._middle {
    width: 15vw;
  }
  .custom-image-style-1{
    border:solid 5px #fff;
  }
  .col-lg-6.about-img{
    margin: 10% auto;
  }
  .custom-image-style-1._left {
     left: 8%; 
  
  }
}