body {
  font-family: Arial;
  background: #f9f9f9;
  text-align: center;
  margin: 0;
}
h1, h2 { color: #00ADB5; }
input {
  padding: 10px; margin: 5px; width: 80%; max-width: 300px;
}
.book {
  background: white; margin: 10px auto; padding: 15px;
  width: 90%; max-width: 300px; border-radius: 10px;
}
button {
  background: #FF6B6B; color: white; border: none;
  padding: 10px; margin: 5px; cursor: pointer;
  border-radius: 5px; width: 80%; max-width: 300px;
}