estilos.css

h1 {
		color: red;
}

article li {
	color: #00f;
}

article li strong {
	color: #000;
}

aside {
	float: left;
	width: 30%;
	clear: both;
}

section {
	float: left;
	width: 70%;
}

#formacion {
	float: left;
	width: 50%
}

#experiencia {
	float: left;
	width: 50%;
}

article li .actual {
	font-weight: bolder;
	font-size: 1.2em;
}

nav ul {
	padding: 0;
}

nav ul li {
	display: inline;
}

nav ul li a {
	font-family: Arial;
	font-size: 11px;
	text-decoration: none;
	float: left;
	padding: 10px;
	background-color: #2175bc;
	color: #fff;
}

nav ul li a:hover {
	background-color: #2586d7;
	margin-top: -2px;
	padding-bottom: 12px;
}

footer {
	clear: both;
	background-color: yellow;
	overflow: hidden; 
	border: 2px solid black;
	width: 100%;
}

@media screen and (min-width: 601px) and (max-width: 1000px){
 	body {
 		font-family: Arial, sans-serif;
 	}
 	aside {
		 float: left;
		 width: 40%;
		 clear: both;
 	}
 	section {
 		float: left;
 		width: 60%;
 	}
 	#formacion {
 		width: 100%;
 	}
 	#experiencia {
 		width: 100%;
 	}


}

@media screen and (max-width: 600px){
	body {
 		font-family: Arial;
 	}
 	aside {
		 float: left;
		 width: 100%;
		 clear: both;
 	}
 	section {
 		float: left;
 		width: 100%;
 	}
 	#formacion {
 		width: 100%;
 	}
 	#experiencia {
 		width: 100%;
 	}
	
}

header {
	background-color: #f48fb1;
	border: 2px solid black;
}