Apple Mac mini (Intel-based; Mid 2007) - Manual (Page 54)

54 Chapter 4 Last, but Not Least
You may have to raise the chair so that your forearms and hands are at the proper
angle to the keyboard. If this makes it impossible to rest your feet flat on the floor,
you can use a footrest with adjustable height and tilt to make up for any gap
between the floor and your feet. Or you can lower the desktop to eliminate the need
for a footrest. Another option is to use a desk with a keyboard tray that’s lower than
the regular work surface.
 Position the mouse at the same height as your keyboard. Allow adequate space to
use the mouse comfortably.
 Arrange the display so that the top of the screen is slightly below eye level when
you’re sitting at the keyboard. The best distance from your eyes to the screen is up to
you, although most people seem to prefer 18 to 28 inches (45 to 70 cm).