*{ padding: 0; margin: 0; }

body { background-color: white; }

#contenedor { background-color: whitesmoke; border: solid; border-width: 1px; margin-left: auto; margin-right: auto; height: auto; max-width: 960px; }

header { height: auto; border: solid; border-width: 1px; margin-bottom: 10px; } 

nav { float: right; height: auto; border: solid; border-width: 1px; }

nav ul { margin-top: 25px; list-style-type: none; }

nav li { border: solid; border-width: 1px; font-size: 12px; float: right; margin-right: 15px; }

nav a { font-size: 16px; color: rgba(0,0,0,0.7); }

nav a:hover { font-size: 16px; color: rgb(0,0,0); }

main { border: solid; border-width: 1px; height: auto; }

main p { color: rgba(0,0,0,0.8); }

h2 { color: rgba(0,0,0,0.2); }

h3 { color: rgba(0,0,0,0.5); }

h4 { color: rgba(0,0,0,0.6); }

article { padding: 10px; border: solid; border-width: 1px; width: 600px; }

article img { height: 170px; float: left; margin-right: 50px; }

aside { padding: 10px; border: solid; border-width: 1px; float:right; width: 300px; }

footer { padding-top: 20px; padding-bottom: 20px; clear: both; border: solid; border-width: 1px; height: auto; }

footer p { font-size: 12px; color: rgba(0,0,0,0.3); }