box-shadow: none|h-offset - v-offset - blur - spread - color - |inset|initial|inherit;
box-shadow: 10px 10px 8px 10px #888888;
box-shadow: 5px 10px inset;
box-shadow: 5px 5px blue, 10px 10px red, 15px 15px green;
( spread: Optional. The spread radius. A positive value increases the size of the shadow,
a negative value decreases the size of the shadow)
(inset: Optional. Changes the shadow from an outer shadow (outset) to an inner shadow)