.book-container {
  margin-top: 2rem;
  margin-bottom: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  position: relative;
  z-index: 0;
}

.controls {
  padding: 2rem 1rem;
  font-size: 1rem;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: transform 0.5s;
  position: relative;
  z-index: 10;
}

.book,
.pdf-book {
  position: relative;
  width: 700px;      /* Juster efter behov */
  height: 900px;     /* Juster efter behov */
  transform-style: preserve-3d;
  transition: transform 0.5s;
}

.paper {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  transform-style: preserve-3d;
  transform-origin: left center;
  z-index: 1;
  transition: transform 0.6s ease;
}

.front,
.back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  transform-origin: left center;
}

.front {
  transform: rotateY(0deg);
}

.back {
  transform: rotateY(180deg);
}

.paper.flipped .front {
  transform: rotateY(-180deg);
}

.paper.flipped .back {
  transform: rotateY(0deg);
}

.front-content,
.back-content {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  cursor: pointer;
  max-width: 100%;
  max-height: 100%;
  display: block;
}