.center {
	text-align: center;
	margin-left: auto;
	margin-right: auto;
}

.button {
  border: 4px solid green;
  color: black;
  text-align: center;
  text-decoration: none;
  text-shadow: 2px 2px 8px #aaaaaa;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
}

.exbutton {
  width: 200px; 
  height: 80px;
}

.exnavigation {
  width: 200px; 
  height: 40px;
}

.dropshadow {
	border:2px solid black;
	box-shadow: 10px 10px 5px grey;
	-moz-box-shadow: 10px 10px 5px grey;
	-webkit-box-shadow: 10px 10px 5px grey;
	-khtml-box-shadow: 10px 10px 5px grey;
}