horizontal offset (move shadow left or right)
vertical offset (move shadow up or down)
blur (make shadow blurry)
color (change color of shadow)
You can provide five values for:
horizontal offset
vertical offset
blur
blur distance (make shadow spread)
color
You can make the shadow inside
You can make the shadow go to the right...
You can make the shadow only appear on the top....
Or only on the bottom....
Or even both the left and right side of the div!