H1 {
	text-align: center;
}
H2 {
	color: black;
	border: 2px solid navy;
	background-color: aquamarine;
}
H3 {
	color: white;
	border: 2px solid navy;
	background-color: navy;
}
H4 {
	color: black;
	border: 2px solid navy;
}
XMP {
	border: 1px solid gray;
}