body {
	width: 90%;
	text-align:left;
	width: 800px;
	margin:auto;
	
}

li {
	list-style:none;
	display:inline-block;
	margin: 0;
	padding:0;
	float:left;

} 

ul {
	padding:0;
}


section#fixed-size-grid-items aside {
	width:170px;
	font-size: 0.8rem;
	display: inline-block;
	list-style: none;
	margin: 10px;
	float:left;
}

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

}

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

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

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

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

@media screen and (max-width: 500px) {
	h1 {
		font-size: 1.54rem;
	}
}