body {
  margin: 0;
  font-family: sans-serif;
  background: #f5f5f5;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#book-container {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 20px;
}

canvas {
  margin: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
  user-select: none;
  pointer-events: none;
}

#controls {
  margin: 20px;
}

@media (max-width: 768px) {
  #page-left {
    display: none;
  }
}