Shadow on upper-left.
box-shadow: -10px -10px orange;
Shadow on lower-right.
box-shadow: 10px 10px orange;
Blurred edges.
box-shadow: 10px 10px 20px orange;
Spread-out shadow.
box-shadow: 10px 10px 20px 10px orange;
Inset shadow.
box-shadow: 10px 10px 20px orange inset;