.cards {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 70vh;
  margin-bottom: 90px;
}
.custom-card {
  position: absolute;
  width: 100%;
  top: 0px;
  height: 70vh;background: #fff;

}
.card1 {
}
.card2 {
  top: 30px;
}
.card3 {
  top: 60px;
}
.card4 {
  top: 90px;
}
.opacity {
  -moz-transition: 0.4s ease;
  -ms-transition: 0.4s ease;
  -o-transition: 0.4s ease;
  transition: 0.4s ease;
  -webkit-transition: 0.4s ease;
  opacity: 0.6;
}
.scale {
  moz-transition: 0.4s ease;
  -ms-transition: 0.4s ease;
  -o-transition: 0.4s ease;
  transition: 0.4s ease;
  -webkit-transition: 0.4s ease;
  width: 95%;
}