body{
	padding:0;
	margin:0;
}
body{
	width:800px;
	align-content: center;
	margin:auto;
}
ul{
	padding:0;
}
li{
	list-style: none;
}

section#fixed-size-grid-items aside{
	font-size: .8rem;
	width:170px;
	margin:10px;
}

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

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

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

section#stretchable-grid-items ul{
	margin: 1rem -10px 1rem -10px;
}
@media screen and (max-width:800px){ 

	body{
	width:90%;
	}
}

@media screen and (min-width:650px){ 

	body{
	background-color: #eaf6ff;
	}
}

@media screen and (min-width:650px){ 

	h1{
	font-size:2.5rem;
	}
}

@media screen and (max-width:500px){ 

	h1{
	font-size: 1.5rem;
	}
}

@media screen and (min-width:480px){ 

	section#stretchable-grid-items li{
	width: 50%;
	}
}
@media screen and (min-width:640px){ 

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