* {
 	box-sizing: border-box;
}

body {
	font-family: Sans-Serif;
	margin: 0;
}

a {
	text-decoration: none;
}
a:hover {
	text-decoration: underline;
}

div[header], div[footer] {
	font-size: 14px;
	background-color: #ddd;
	padding: 8px 3%;
	display: flex;
	justify-content: space-between;
}

[content] {
	margin-left: 3%;
	margin-right: 3%;
	margin-bottom: 2em;
}

[hidden] {
	display: none;
}