#wrapper{
	display:flex;
	flex-direction:row;
	flex-wrap: wrap;
	border-style: solid;
	border-color:red;
	max-width:800px;
	margin: 0 auto;
}

header{
	border-style: solid;
	flex-basis: 100%
}

nav{
	border-style: solid;
	flex-basis: 100%;
}

main{
	border-style: solid;
	flex-basis: 400px;
	flex-grow: 1;
	flex-shrink: 1;
	min-height: 200px;
}

aside{
	border-style: solid;
	flex-basis: 200px;
}

footer{
	border-style: solid;
	flex-basis: 100%;
}