  :root {
    --vu: whitesmoke;
    --mu: whitesmoke;
    --ku: red;
  }

  .bookshelf {
    align-items: flex-start;
    flex-wrap: nowrap;
    width: 100%;
    background: var(--gu); 
    height: 160px; 
    background-clip: content-box; 
    padding-bottom: 10px; 
    overflow-x: scroll;
  }

  .book {
    position: relative;
    background: var(--mu);
    padding: 5px;
    width: 30px;
    height: 150px;
    text-decoration: none;
  }

  .book:hover {
    background: var(--mu);
    transform: translateY(10px); 
    box-shadow: 0px -10px 0px 0px white;
    cursor: pointer;
  }

  .book .text {
    display: inline-block;
    color: var(--ku);
    transform: translate(-44%, 350%) rotate(-90deg);
    width: 140px;
    pointer-events: none;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
  }

  #page {
  display: none;
  background: white;
  padding: 10px;
  width: 100%;
  height: 60vh;
  overflow: scroll;
  margin-top: 20px;
  padding: 15px;
  }