h1{
	color: red;
}
#principale{
	font-weight: bold;
}
header{
	font-weight: bold;
	text-align: center;
	height: 40px;
	width: 85%;
	margin: 25px;
	padding: 25px;
}
article{
	
	display: inline-block;
	height: 600px;
	width: 40%;
}
aside{
	width: 30%;
	display: inline-block;
	text-align: center;
}