style.css

* {
	box-sizing: border-box;
	font-size: 100%;
	font-weight: normal;
	margin: 0;
	padding: 0;
}

body {
	font-family: sans-serif;
}

h1 {font-size: 240%; }
h2 {font-size: 150%; }
h3 {font-size: 125%; }

h1, h2, h3 {
	color: #FF5511;
	padding: 0.5rem 1rem;
	margin: 0.5rem -1rem -0.5rem -1rem;
}

p {
	margin-top: 0.5rem;
}

header, main, footer {
	max-width: 30em;
	margin: 1em auto;
	padding: 1em;
}

li {
	margin: 0 0 0 2em;
}

nav ul {
	margin-top: 1rem;
	display: flex;
	flex-direction: row;
	justify-content: space-between;
}

nav li {
	list-style-type: none;
	margin: 0;
}

nav li>a {
	padding: 0.5rem;
	background: #BB0000;
	color: white;
	border-radius: 0.25rem;
	text-decoration: none;
	display: block;
}


nav li>a:hover {
	background: green;
	color: #000;
}

:target {
	background: #BB0000;
	color: white;
}

@media (max-width: 700px) {

	h1 {font-size: 140%; }
	h2 {font-size: 120%; }
	h3 {font-size: 105%; }

	nav ul {
		flex-direction: column;
	}

}