.bookshelf_wrapper {
  display: inline-block;
  position: relative;
  width: 100%;
}

.bookshelf_wrapper.paused .book_item,
.bookshelf_wrapper.paused .shelf:before,
.bookshelf_wrapper.paused .shelf:after {
  animation-play-state: paused;
}

.bookshelf_wrapper.paused .book_item,
.bookshelf_wrapper.paused .book_item:before,
.bookshelf_wrapper.paused .book_item:after {
  border-color: #E4A8A8;
}

.bookshelf_wrapper.paused .book_item.first:before,
.bookshelf_wrapper.paused .book_item.first:after,
.bookshelf_wrapper.paused .book_item.sixth::before,
.bookshelf_wrapper.paused .shelf::before,
.bookshelf_wrapper.paused .shelf::after {
  background-color: #E4A8A8;
}

.books_list {
  margin: 0 auto;
  width: 300px;
  height: 135px;
  padding: 0;
}

.book_item {
  position: absolute;
  bottom: 0px;
  box-sizing: border-box;
  list-style: none;
  width: 40px;
  height: 120px;
  opacity: 0;
  background-color: #FFF;
  border: 3px solid #CCC;
  transform-origin: bottom left;
  transform: translateX(300px);
  animation: travel 2500ms linear infinite;
  transition: border-color 0.5s ease-out, background-color 0.5s ease-out, color 0.5s ease-out;
}

.book_item.first {
  height: 140px;
}

.book_item.first:before, .book_item.first:after {
  content: '';
  position: absolute;
  top: 10px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: #CCC;
}

.book_item.first:after {
  top: initial;
  bottom: 10px;
}

.book_item.second:before, .book_item.second:after, .book_item.fifth:before, .book_item.fifth:after {
  box-sizing: border-box;
  content: '';
  position: absolute;
  top: 10px;
  left: 0;
  width: 100%;
  height: 10.5px;
  border-top: 3px solid #CCC;
  border-bottom: 3px solid #CCC;
}

.book_item.second:after, .book_item.fifth:after {
  top: initial;
  bottom: 10px;
}

.book_item.third:before, .book_item.third:after {
  box-sizing: border-box;
  content: '';
  position: absolute;
  top: 10px;
  left: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 3px solid #CCC;
}

.book_item.third:after {
  top: initial;
  bottom: 10px;
}

.book_item.fourth {
  height: 130px;
}

.book_item.fourth:before {
  box-sizing: border-box;
  content: '';
  position: absolute;
  top: 46px;
  left: 0;
  width: 100%;
  height: 10.5px;
  border-top: 3px solid #CCC;
  border-bottom: 3px solid #CCC;
}

.book_item.fifth {
  height: 100px;
}

.book_item.sixth {
  height: 140px;
}

.book_item.sixth:before {
  box-sizing: border-box;
  content: '';
  position: absolute;
  bottom: 31px;
  left: 0px;
  width: 100%;
  height: 3px;
  background-color: #CCC;
}

.book_item.sixth:after {
  box-sizing: border-box;
  content: '';
  position: absolute;
  bottom: 10px;
  left: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 3px solid #CCC;
}

.book_item:nth-child(2) {
  animation-delay: 416.66667ms;
}

.book_item:nth-child(3) {
  animation-delay: 833.33333ms;
}

.book_item:nth-child(4) {
  animation-delay: 1250ms;
}

.book_item:nth-child(5) {
  animation-delay: 1666.66667ms;
}

.book_item:nth-child(6) {
  animation-delay: 2083.33333ms;
}

.shelf {
  width: 320px;
  height: 3px;
  margin: 0 auto;
  background-color: transparent;
  position: relative;
}

.shelf:before, .shelf:after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: #D6D6D6;
  background-image: radial-gradient(rgba(255, 255, 255, 0.5) 30%, transparent 0);
  background-size: 10px 10px;
  background-position: 0 -2.5px;
  top: 200%;
  left: 5%;
  animation: move 250ms linear infinite;
}

.shelf:after {
  top: 400%;
  left: 7.5%;
}

@keyframes move {
  from {
    background-position-x: 0;
  }
  to {
    background-position-x: 10px;
  }
}

@keyframes travel {
  0% {
    opacity: 0;
    transform: translateX(300px) rotateZ(0deg) scaleY(1);
  }
  6.5% {
    transform: translateX(279.5px) rotateZ(0deg) scaleY(1.1);
  }
  8.8% {
    transform: translateX(273.6px) rotateZ(0deg) scaleY(1);
  }
  10% {
    opacity: 1;
    transform: translateX(270px) rotateZ(0deg);
  }
  17.6% {
    transform: translateX(247.2px) rotateZ(-30deg);
  }
  45% {
    transform: translateX(165px) rotateZ(-30deg);
  }
  49.5% {
    transform: translateX(151.5px) rotateZ(-45deg);
  }
  61.5% {
    transform: translateX(115.5px) rotateZ(-45deg);
  }
  67% {
    transform: translateX(99px) rotateZ(-60deg);
  }
  76% {
    transform: translateX(72px) rotateZ(-60deg);
  }
  83.5% {
    opacity: 1;
    transform: translateX(49.5px) rotateZ(-90deg);
  }
  90% {
    opacity: 0;
  }
  100% {
    opacity: 0;
    transform: translateX(0px) rotateZ(-90deg);
  }
}