body {
	font-family: verdana;
}

#contenedor {
	width: 80%;
	margin: 0 auto;
}

#logotipo {
	width: 120px; height: 120px;
	background-image: url("fotos/logo.jpg");
	float: left;
	margin: 0px 10px;
}

#contenido {
	clear: both;
}

nav, section, aside {
	float: left;
}

nav {
	width: 15%;
}

section {
	width: 50%;
}

aside {
	width: 30%;
}

article {
	float: left;
	width: 45%;
	border: 1px solid silver;
	padding: 5px;
	margin: 0 10px 10px 0;
}

footer section {
	width: 30%;
	background-color: yellow;
	padding-bottom: 30px;
}