body {
	width: 800px;
	margin: auto;

}

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


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

@media screen and (min-width: 640px){
	h1{
		font-size:2.5rem;}
}

section#fixed-size-grid-items ul{
	list-style-type: none;
}

section#fixed-size-grid-items li{
	box-sizing: border-box;
	width: 170px;
	margin-right: 10px;
	display:inline-block;
	font-size:.8rem;
}

section#stretchable-grid-items ul{
	list-style-type: none;
	margin-left:-10px;
	margin-right:-10px;
	margin-top:1rem;
	margin-bottom:1rem;
}

section#stretchable-grid-items li{
	box-sizing: border-box;
	width: 100%;
	font-size:.8rem;
}

@media screen and (min-width: 480px){
	section#stretchable-grid-items li{
	box-sizing: border-box;
	width: 50%;
	font-size:.8rem;
	display:inline-block;
	}
}

@media screen and (min-width: 640px){
	section#stretchable-grid-items li{
	box-sizing: border-box;
	width: 25%;
	font-size:.8rem;
	display:inline-block;
	}
}

section#stretchable-grid-items aside{
	margin:10%;
}