body {
	width:800px;
	margin:auto;
}

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

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

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

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

ul {
	padding:0;
	margin-left:-10px;
	margin-right:-10px;
	margin-top:1rem;
	margin-bottom:1rem;
}

#stretchable-grid-items ul {
	margin-left:-10px;
	margin-right:-10px;
	margin-top:1rem;
	margin-bottom:1rem;
}

#fixed-size-grid-items aside {
	margin:10px;
	font-size:0.8rem;
	display:inline-block;
	width:170px;
}

li {
	list-style:none;
	display:inline-block;
	vertical-align: top;
}