*{
	padding: 0;
	 margin: 0;
}
body {
	background-color:#008080; 
}
#contenedor{
	width: 950px;
	margin: auto;
}
main{
	text-align: center;
	color: white;
	line-height: 50px;
	width: 950px;
	height: 100px;
	background-color: #000000;
}
header nav{
	text-align: center;
	background-color: #000080;
}
header nav ul li{
	display: inline-block;
	padding: 10px;
}
header nav ul li a{
	
	font-family: arial;
	font-size: 20px;
	color: black;
	font-weight: bold;
}
header nav ul li a:hover{
	color: white;
}
section{
	float: left;
	width: 750px;
	height: 450px;
	margin-top: 5px;
	margin-bottom: 5px; 
	background-color: white;
}
aside {
	margin-top: 5px;
	float: left;
	width: 195px;
	height: 300px;
	margin-left: 5px;  
	background-color: white;
}
aside:nth-of-type(1){
	height: 50px;
}
footer{
	clear: both;
	width: 950px;
	height: 50px;
	background-color: #000000;
	text-align: center;
	color: white;
	line-height: 50px;
	font-style: italic;
}