.desktop-design {
  margin: 0;
    padding: 0rem 31px 117px 0px;
    background-color: #44607200;
    font-family: 'facebook sans';
    color: #1f8da6;
    overflow: hidden;
}
h1 {
  margin-top: 2rem;
  text-align: center;
}
h1 + p {
  text-align: center;
}
.shelf {
  position: relative;
  width: 30rem;
  height: 14rem;
  margin: 0 auto;
  border: 0.5rem solid #1F8DA6;
  border-radius: 0.5rem;
  background-color: rgba(255, 255, 255, 0.1);
  perspective: 130rem;
  box-shadow: inset 0 0 2rem rgba(0, 0, 0, 0.2);
}
.door {
  position: absolute;
    width: 14.8rem;
    height: 14rem;
    display: flex;
    box-sizing: border-box;
    padding: 1rem;
    margin-top: -9px;
    background-color: #1F8DA6;
    align-items: center;
    box-shadow: 0 1px 1px rgb(0 0 0 / 30%);
    outline: 1px solid transparent;
}
.door::before {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.1);
    content: "";
  }
.door.left {
    border-radius: 0 0.75rem 0.75rem 0;
    justify-content: flex-end;
    -webkit-animation: 
      leftDoorOpen 3.5s ease-out forwards 1s,
      leftDoorFlap 15s linear infinite forwards 9s;
            animation: 
      leftDoorOpen 3.5s ease-out forwards 1s,
      leftDoorFlap 15s linear infinite forwards 9s;
    transform-origin: 0 0 0;
  }
.door.right {
    right: 0;
    border-radius: 0.75rem 0 0 0.75rem;
    -webkit-animation: 
      rightDoorOpen 3s ease-out forwards 1.5s,
      rightDoorFlap 10s linear infinite forwards 8s;
            animation: 
      rightDoorOpen 3s ease-out forwards 1.5s,
      rightDoorFlap 10s linear infinite forwards 8s;
    transform-origin: 100% 0 0;
  }
.book {
      position: absolute;
    box-sizing: border-box;
    padding: 0.8rem 2rem 0.8rem 2rem;
    border-radius: 0.25rem;
    background-color: rgba(255, 255, 255, 0.1);
    color: #2c4a73cf;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    cursor: pointer;
    font-weight: 600;
    box-shadow: inset 0 0 0.75rem rgb(31 141 166);
}
.book.home-page {
    transform: rotate(-90deg) translate(-12.4rem, 3rem);
    transform-origin: 0;
  }
.book.about-us {
    transform: rotate(-100deg) translate(-13.4rem, 6.1rem);
    transform-origin: 0;
    outline: 1px solid transparent;
  }
.book.contact {
    right: 2rem;
    bottom: 0.2rem;
    border-radius: 0.3rem 0 0 0.3rem;
  }
.book.faq {
   right: 0.8rem;
    bottom: 3.3rem;
    border-radius: 0.3rem 1 0 0.3rem;
  }
.book.not-found {
    width: 12rem;
    height: 3.5rem;
    border: 1px dashed rgba(255, 255, 255, 0.3);
    background-color: transparent;
    transform: rotate(-90deg) translate(-12rem, 13rem) scale(1);
    transform-origin: 0;
    cursor: default;
    -webkit-animation: bookFadeOut 1s 3s infinite forwards;
            animation: bookFadeOut 1s 3s infinite forwards;
  }
.book.not-found::after {
      display: block;
      width: 10rem;
      padding-left: 5rem;
      background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='80' height='30'><path fill='rgb(255, 255, 255)' d='M7.688,3.737C6.1,10.409,4.624,16.982,2.475,23.517c-0.424,1.29,0.724,2.338,1.957,1.916 c5.879-2.021,11.743-4.107,17.409-6.696c1.246-0.572,0.443-2.366-0.815-1.932c-3.856,1.333-7.695,2.69-11.565,3.959 c2.879-2.526,5.485-5.215,9.013-7.17c4.441-2.459,9.299-4.109,14.281-4.915c10.903-1.772,22.052,0.562,31.979,5.04 c9.241,4.162,12.895,8.725,13.164,4.942c0.121-1.69-5.57-4.953-14.125-8.714C53.19,5.292,41.094,3.539,29.636,6.058 c-7.122,1.567-16.708,5.374-22.064,11.544c1.359-4.455,2.461-9.028,3.032-13.563C10.852,2.091,8.12,1.927,7.688,3.737z'/></svg>");
      background-repeat: no-repeat;
      background-size: 4rem;
      background-position: left center;
      font-family: "Dancing Script";
      text-transform: lowercase;
      font-size: 25px;
      content: "";
      transform: rotate(90deg) translate(6rem, -1rem);
      opacity: 0.3; 
    }
.book:hover:not(.not-found) {
    background-color: rgba(255, 255, 255, 0.2);
  }
@-webkit-keyframes leftDoorOpen {
  60% {transform: rotateY(-115deg)}
  100% {transform: rotateY(-110deg)}
}
@keyframes leftDoorOpen {
  60% {transform: rotateY(-115deg)}
  100% {transform: rotateY(-110deg)}
}
@-webkit-keyframes rightDoorOpen {
  60% {transform: rotateY(125deg)}
  100% {transform: rotateY(120deg)}
}
@keyframes rightDoorOpen {
  60% {transform: rotateY(125deg)}
  100% {transform: rotateY(120deg)}
}
@-webkit-keyframes rightDoorFlap {
  0% { transform: rotateY(120deg)}
  5% {transform: rotateY(125deg)}
  15% {transform: rotateY(117deg)}
  25% {transform: rotateY(123deg)}
  30% {transform: rotateY(120deg)}
  100% {transform: rotateY(120deg)}
}
@keyframes rightDoorFlap {
  0% { transform: rotateY(120deg)}
  5% {transform: rotateY(125deg)}
  15% {transform: rotateY(117deg)}
  25% {transform: rotateY(123deg)}
  30% {transform: rotateY(120deg)}
  100% {transform: rotateY(120deg)}
}
@-webkit-keyframes leftDoorFlap {
  0% { transform: rotateY(-110deg)}
  5% {transform: rotateY(-115deg)}
  15% {transform: rotateY(-107deg)}
  25% {transform: rotateY(-113deg)}
  30% {transform: rotateY(-110deg)}
  100% {transform: rotateY(-110deg)}
}
@keyframes leftDoorFlap {
  0% { transform: rotateY(-110deg)}
  5% {transform: rotateY(-115deg)}
  15% {transform: rotateY(-107deg)}
  25% {transform: rotateY(-113deg)}
  30% {transform: rotateY(-110deg)}
  100% {transform: rotateY(-110deg)}
}
@-webkit-keyframes bookFadeOut {
  50% {border: 1px dashed rgba(255, 255, 255, 0.1);}
}
@keyframes bookFadeOut {
  50% {border: 1px dashed rgba(255, 255, 255, 0.1);}
}