body {
	font-family: Arial, Helvetica, sans-serif;
	margin: 0 auto;
	padding: 20px;
	width: 600px;
	border: 3px solid blue;
}
	
h1, ul {
	margin: 0;
	padding: 0;
}
h2 {
	font-size: 125%;
	cursor: pointer;	
}
ul {
	list-style-type: none;
}
.hidden {
	display: none;
}