*{
marging: 0;
padding: 0;
font-family: verdana;
text-decoration: none;

}
header
{
background-color:azure; font-size: 3em; text-align: center; color: darkorange;
    margin-top: 3%; width: auto;
}

#contenedor {
    width: 980px;
    margin: 0 auto;
}

main
{background-color: brown;
}
footer
{
    background-color: azure; font-size: 0.8em;
}
aside
{
    background-color: lightgreen;
}

nav {
    background-color: cadetblue;

    padding-top: 0.1%;
    padding-left: 2.7%;
    margin-top: 2%;
    overflow: auto;
}

nav li {
    list-style: none;
    display: inline-block;
    margin-right: 3.3%;   
}

nav a {
    color: white;
}
/*

nav ul li a{
    color: white;
   
 
    display: inline-block;
    padding-top: 8%;
    
    overflow: auto;
    float: right;
    
}

nav ul li a:hover{
    color: black; background-color: cadetblue;
}

nav ul li{
    display: inline-block;
    width:auto;
    list-style-type: none;
    
}
*/
.contenedor {
    width:auto;
    max-width:none;
    margin: 0 auto;
    overflow: hidden;
}
h1, h3{
    color: darkorange;
    margin-left: 3%;
}

#marcos {
    max-width: 10%;
    float: left;
    margin-left: 3%
    }
#texto {
    font-size: 0.8em;
    float: left;
    max-width: 70%;
    padding: 1%;
    margin-left: 2%;
    margin-right: 12%;
    }

#materias{
    list-style: none;
    margin-left: 16%;
    color: chocolate;
    font-size: 0.9em;    
}


img {
    max-width: 100%;
}
.imagen {
    float: left;
    max-width: 45%;
    margin: 2%;
    
}

footer{
    clear: both;
    padding: 0 3% 1% 3%;
}