body {
  background-image: url("bg-book2.jpg");
  background-color: #017199;
Background-attachment:fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;


}

.center {
  margin: auto;
  margin-top: 200px;
}

#header {
  font-family: 'Righteous', sans-serif;
  font-size: 3rem;
}

h2 {
  font-family: 'Righteous', sans-serif;
}

.book-list {
  margin-top: 50px;
  visibility: hidden;
}