body{
	background-color: white;
	color: white;
}

header{
	width: 90%;
	background-color: yellow;
	height: 5x;
	margin: 0px auto 0px;
	color: black;
	text-align: center;
	font-size: 1.5em;
}

nav{
	width: 50%;
	background-color: gray;
	height: 30px;
	margin: 0px auto 0px;
	color: white;
	text-align: center;
	font-size: 1.2em;
}

footer{
	width: 90%;
	background-color: green;
	height: 80px;
	margin: 0px auto 0px;
	color: red;
	text-align: center;
	font-size: 1em;
}

section{
	width:70%;
	background-color: blue;
	color: white;
	text-align: center;
	font-size: 1em;
	border: 2px solid #FFF;
	margin-top: 35px;
}

aside{
	width: 25%;
	background-color: gray;
                 height: 290px;
	color: white;
	text-align: center;
	font-size: 1em;
	border: 1px solid #FFF;
	margin-left: 10px;
	margin-top: 35px;
	position: absolute;
}

section, aside{
	display: inline-block;
}

article{
	width: 90%;
	border: 1px solid #FFF;
	margin: 0 auto;
	background-color: #999933;
}
#contenido{
	width: 90%;
	margin: 0px auto 0px;
	color: black;
}
.espacio-derecha{
	margin-right: 2em;
}
.espacio-arriba{
	margin-top: 100px;
}