body {
	padding: 0;
	margin: 0;
	margin: auto;
	width: 800px;
	box-sizing: border-box;
}

section#fixed-size-grid-items li {
	display: inline-block;
}

section#fixed-size-grid-items aside {
	width: 170px;
	box-sizing: border-box;
	margin: 10px;
	font-size: 0.8rem;
}

section#fixed-size-grid-items ul{
	list-style: none;
	padding-left: 0;
}

section#stretchable-grid-items li {
	display: inline-block;
	width: 100%;
}

section#stretchable-grid-items aside {
	margin: 10%;
	font-size: 0.8rem;
}

section#stretchable-grid-items ul{
	margin: 1rem -10px 1rem -10px;
	list-style: none;
	padding-left: 0;
}

@media screen and (max-width: 890px) {
	body {
		padding: 0;
		margin: 0;
		width: 90%;
		margin: auto;
		box-sizing: border-box;
	}
}

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

@media screen and (min-width: 480px) {
	section#stretchable-grid-items li {
		display: inline-block;
		width: 50%;
	}
}

@media screen and (min-width: 640px) {
	body {
		background-color: #eaf6ff;
	}
	h1 {
		font-size: 2.5rem;
	}
	section#stretchable-grid-items li {
		display: inline-block;
		width: 25%;
	}
}