body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
#linkBack {
  position: fixed;
  left: 20px;
  top: 20px;
  color: black;
  font-family: consolas;
}

#viewer {
  position: relative;
  width: 45%;
  height: 70%;
  cursor: pointer;
}

#page {
  position: absolute;
  top: 50%;
  left: 50%;
  max-width: 100%;
  max-height: 100%;
  transform: translate(-50%, -50%);
  object-fit:cover;
  user-select: none;
  pointer-events: none;
}

.hint-left,
.hint-right {
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
}

.hint-left:hover {
  background: linear-gradient(to right, rgba(255, 255, 255, 0.85), transparent);
}

.hint-right:hover {
  background: linear-gradient(to left, rgba(255, 255, 255, 0.85), transparent);
}

.hint-left { left: 0; }
.hint-right { right: 0; }