body {background:#F6F6F6; font-family: calibri;}
h1  { font-size: 60px; color:#ffffff;}

header{ background-color:#5FB677;
       text-align: center;
    text-transform: uppercase;
    padding: 0.1rem;
    margin-top: -1rem;}
    
.contenedor{
    width: 100%;
    max-width:70rem;
    margin: auto;}

/*---nav---*/
nav ul {
    list-style-type:none;
    background-color: #91C470;
    margin: -0.01rem;
    font-size: 15px;
}

.materias{
    text-align-last:inherit;
    font-size: 1rem;
    width: 40%;
    margin: auto;
}
nav ul li a{
    text-decoration: none;
    color: #ffffff
}

nav ul li{
    display: inline-block;
    padding: 1rem;
    
}

nav{
    text-align:center;
}


/*----section----*/

img{ float:right;
    margin-right: -2rem;
   }

.propuesta{
    text-align: left;
    font-family: calibri;
    margin: center;
}

footer { padding-top: 10rem;
       text-align: center; 
       width: 100%;
       max-width: 70rem;
        margin: auto;
       font-family: calibri;
      font-size: 12px;