* {
	box-sizing: border-box;
}

html, body {
	height: 100%;
	overflow: auto;
}

body {
	display: flex;
	flex-direction: column;
	margin: 0;
}

aside {
	flex: 20%;
	background-color: brown;
}

aside h1 {
	margin-left: 10px;
}

nav {
	padding: 5px 20px;
	background-color: brown;
}

nav a {
	font-size: 14px;
	color: white;
	background-color: darkslategray;
	text-align: center;
	margin-right: 5px;
	padding: 10px;
	transition: all linear 0.1s;
	display: inline-block;
}

nav a:hover {
	background-color: crimson;
}

main {
	flex: 1;
	padding: 20px;
	background-color: cadetblue;
}

main img {
	width: 100%;
	max-width: 400px;
}

footer {
	background-color: darkgreen;
	padding: 10px;
	text-align: right;
}