.reader .reader-body{
  padding: 16px;
  background: #111; /* default: dark reading pane */
  color: #f5f5f5;
  border: 1px solid #222;
  border-radius: 8px;
  line-height: 1.9;
}
.reader.vertical .reader-body{
  writing-mode: vertical-rl;
  text-orientation: mixed;
}
.reader.light .reader-body{
  background: #fff;
  color: #111;
  border: 1px solid #e6e9f2;
}
.reader.grid .reader-body{
  background-image: repeating-linear-gradient(0deg, rgba(0,0,0,0.06) 0, rgba(0,0,0,0.06) 1px, transparent 1px, transparent 20px),
                    repeating-linear-gradient(90deg, rgba(0,0,0,0.06) 0, rgba(0,0,0,0.06) 1px, transparent 1px, transparent 20px);
  background-size: 20px 20px;
}