body{
	padding:0;
	margin:0;
}
section#body-width-management{
		width:800px;
		margin:auto;
}

section#background-color{

}

@media screen and (min-width:640px){
	section#background-color{
		background-color:#eaf6ff;
	}
}
@media screen and (min-width:500px) and (max-width:640px){
		h1{
			font-size: 1.5rem;
	}
}