.flipper {
  perspective: 1000px; 
  padding-bottom: 1em;
  margin-bottom: 20px;
}

.flip-card {
  width: 95%;
  height: 490px;
  margin: auto;
  position: relative; 
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.flipper.flip .flip-card {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  width: 100%;
  height: 100%;
  padding: 20px;
  position: absolute;
  top: 0;
  left: 0;
  backface-visibility: hidden; 
  -webkit-backface-visibility: hidden; 
  overflow: auto;
  border: 1px solid #eeeeee;
  border-radius: 5px;
  box-shadow: -5px 5px 10px 0.5px rgb(0, 0, 0, 0.5);
  background-color: #fff; 
}


.flip-card-back {
  transform: rotateY(180deg);
}


.flip-btn {
    cursor: pointer;
    width: 30px;
    font-weight: bold;
    position: absolute;
    top: 10px;
    left: 35px;
    z-index: 50;
    font-size: 1.5em;
    border: none;
    background: none;
}