Examples:
You can provide optional values to get different effects. See CSS comments.
You can provide four values for:
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
box-shadow: 20px 15px 8px 5px lightslategrey;
box-shadow: -30px 10px 8px 5px grey;