Apple Macintosh PowerBook 145B - Manual (Page 48)

m If you prefer, you can adjust the angle of the keyboard by
rotating the elevation feet at both ends of the back panel until
they snap into position.
The back of the keyboard is slightly elevated when the feet are
in use. Otherwise, the keyboard is level.
Mouse
If you use a mouse, position it at the same height as your
keyboard. When you slide the mouse, move your entire arm.
Avoid resting your arm on the desk and bending your wrist as you
move the mouse.
Built-in display
m Adjust the angle of the display to minimize glare and
reflections from lights and windows. Make sure there is
enough light to read the screen easily.
m You may need to adjust the brightness and contrast of the
screen when you take the computer from one work location
to another, or if the lighting in your work area changes.
m Clean the screen regularly (see “Important Care and Safety
Instructions”).
Contrast control
Brightness control
32 Chapter 1: Setting Up Your Macintosh PowerBook