body {
	padding: 0;
	margin: 0;
	max-width: 800px;
	width: 90%;
	margin: auto;
}

li {
	display: inline-block;
}

ul {
	list-style-type: none;
	padding-left: 0;
}

aside {
	box-sizing: border-box;
	margin: 10%;
	font-size: 0.8rem;
}

#fixed-size-grid-items aside {
	width: 170px;
	margin: 10px;
}

#stretchable-grid-items li {
	width: 100%;
}

#stretchable-grid-items ul {
	margin: 1rem -10px;
}

@media screen and (min-width: 480px) and (max-width: 639px) {
	#stretchable-grid-items li {
		width: 50%;
	}
}

@media screen and (min-width: 640px) {
	body {
		background-color: #eaf6ff;
	}

	h1 {
		font-size: 2.5rem;
	}

	#stretchable-grid-items li {
		width: 25%;
	}
}

@media screen and (max-width: 500px) {
	h1 {
		font-size: 1.5rem;
	}
}