body {
  font-family: "Georgia", serif;
  margin: 0;
  padding: 0;
  background: #fdfdfd;
  color: #333;
}
header {
  background: #4b2e83;
  color: white;
  padding: 20px;
  text-align: center;
}
nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}
.hero, .book {
  padding: 40px;
  text-align: center;
}
.btn {
  display: inline-block;
  padding: 10px 20px;
  background: #4b2e83;
  color: white;
  text-decoration: none;
  border-radius: 4px;
}
footer {
  background: #eee;
  text-align: center;
  padding: 20px;
}