Adding box-shadow to a :after pseudo element

A filter will work:

.shadowed {
    -webkit-filter: drop-shadow(0px 2px 2px rgba(130,130,130,1));
    filter        : drop-shadow(0px 2px 2px rgba(130,130,130,1));
    -ms-filter    : "progid:DXImageTransform.Microsoft.Dropshadow(OffX=0, OffY=2, Color="#444")";
    filter        : "progid:DXImageTransform.Microsoft.Dropshadow(OffX=0, OffY=2, Color="#444")";
}

Working Example : http://codepen.io/tolmark12/pen/JopNeR?editors=110

Learn more at : Creating a true cross browser drop shadow