An example of the box shadow property used for creating an inner shadow effect:
box-shadow: inset 1px 1px 1px rgba(0,0,0,0.1); -moz-box-shadow: inset 1px 1px 1px rgba(0,0,0,0.1); -webkit-box-shadow: inset 1px 1px 1px rgba(0,0,0,0.1);