until you zoom. If you zoom, the left bar sticks to the left of the window and increases in size, but when scrolling horizontally only the body content is scro

until you zoom. If you zoom, the left bar sticks to the left of the window and increases in size, but when scrolling horizontally only the body content is scrolled. The result is that the width of the reading space as a percentage of the width of the browser decreases as you zoom in.