$color-bg: #fde3a7;
$book-color-bg: lighten($color-bg, 20%);
$book-color-border: lighten(#000, 85%);
$book-border: 1px solid $book-color-border;

%book-rounded-corners {
  border-top-right-radius: 5px;
  border-bottom-right-radius: 5px;
}

// LOL CSS
body,
html {
  width: 100%;
  height: 100%;
  display: table;
  text-align: center;
}

body {
  background: #fde3a7;
}

ul {
  display: table-cell;
  vertical-align: middle;
}

.list-inline {
  padding-left: 0;
  list-style: none;

  > li {
    display: inline-block;
    margin-left: 2em;
  }

  > li:first-child {
    margin-left: 0;
  }
}

.book {
  @extend %book-rounded-corners;

  cursor: pointer;
  display: block;
  width: 150px;
  height: 220px;
  position: relative;
  background: $book-color-bg; 
  z-index: 1;
  box-shadow: 0 2px 4px 0 rgba(#000, .1), 0 9px 20px 0 rgba(#000, .25);
  overflow: hidden;
  transition: box-shadow .3s linear;
}

.book img {
  @extend %book-rounded-corners;

  width: inherit;
  height: inherit;
  transform-origin: 0 50%;
  transform: rotateY(0);
  transition: all .45s ease;
}

.book:hover {
  box-shadow: 0 2px 4px 0 rgba(#000, .25), 0 9px 20px 0 rgba(#000, .45);

  img {
    transform: rotateY(-25deg);
    box-shadow: 1px 1px 5px 5px rgba(#000, .2);
  }
}

.book::after,
.book::before {
  @extend %book-rounded-corners;

  content: '';
  display: block;
  width: inherit;
  height: inherit;
  position: absolute;
  z-index: -1;
  top: 0;
  background: $book-color-bg;
  border: $book-border;
}

.book::before { left: -3px; }
.book::after { left: -6px; }