body {
  margin: 0;
  background: #111;
  font-family: Arial, sans-serif;
}

#flipbook {
  width: 900px;
  height: 600px;
  margin: 40px auto;
}

.page {
  width: 100%;
  height: 100%;
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
}

canvas {
  max-width: 100%;
  height: auto;
}