html, body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: #f0f4f8;
}

.container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.book-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px; /* space between cards */
    max-width: 1200px;
    margin-top: 20px;
}


.book-card {
  background-color: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  padding: 16px;
  margin: 20px;
  transition: transform 0.2s ease;
}

.book-card:hover {
  transform: scale(1.02);
}

button {
  background-color: #4f46e5; /* Indigo-600 */
  color: white;
  border: none;
  padding: 10px 16px;
  margin: 6px;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

button:hover {
  background-color: #4338ca; /* Darker Indigo */
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
  background-color: #3730a3; /* Even darker Indigo */
}