box-shadow:
0 1px 2px #fff, /*bottom external highlight*/
0 -1px 1px #666, /*top external shadow*/
inset 0 -1px 1px rgba(0,0,0,0.5), /*bottom internal shadow*/
inset 0 1px 1px rgba(255,255,255,0.8); /*top internal highlight*/
box-shadow: 0 1px 2px #fff, /*bottom external highlight*/