#mydiv {
	position:absolute;
	top: 50%;
	left: 50%;
	width:30em;
	height:18em;
	margin-top: -9em; /*set to a negative number 1/2 of your height*/
	margin-left: -15em; /*set to a negative number 1/2 of your width*/
	//border: 1px solid #ccc;
	//background-color: #f3f3f3;
}

.shadow{
	text-shadow: 4px 1px 4px #000000;
}
  
.shadow1{
	text-shadow: 2px 1px 2px #888;
}