body{ 
    background-image: url(imagenes/fondo.png);
    font-size: 16px;
}

.pagina{
    max-width: 960px;
    margin: 0 auto;
}

h1{
    font-size: 0.8rem;
    padding-left: 2%;
    margin-top: 5%;
    color:#47bccb;
    text-align: left;
    line-height: 0;
}

h2{
    font-size: 0.8rem;
    padding-left: 2%;
    margin: 0;
    color:#47bccb;
    text-align: left;
    line-height: 0;
}


p {
    font-size: 0.75rem;
    padding-left: 6%;
    line-height: 15px;
}

a {
    color: #000;
}

.izq {
     padding: 5%;
}

.der{
     padding: 3%
}

header{ 
    width: 98%; 
    height: 150px;
    margin: 0 auto;
    background:#fff; 
    padding-left: 18px;
    padding-top: 29px;
    box-shadow: 0.1rem 0.2rem 0.3rem 0.5rem rgba(204, 204, 204, 0.35);
}

nav{
    width: 100%;
    height: 50px;
    background: rgba(239, 239, 239, 0.88);
    box-shadow: 0.1rem 0.2rem 0.3rem 0.5rem rgba(204, 204, 204, 0.31);
}

nav li {
   
    height: 28px;
    float: left;
    margin:1% 1% 5% 6% ;
    font-family:"Arial" ;
    font-size: 0.8rem;
    text-align: center;
    color: #000;
    line-height: 25px;
    list-style: none;
    border-radius: 2px;
}

article li{
    font-size: 0.75rem;
}
    
.materia{
    width: 50%;
    align-content: center;
}

main{
    width: 100%; 
    height: 505px;
    box-shadow: 20px;
    box-shadow: 0.1rem 0.2rem 0.3rem 0.5rem rgba(204, 204, 204, 0.35);
}

section{
        width: 100%; 
        height: 400px;
        background: rgba(255, 255, 255, 0.39);
        padding-top: 15px;
        font-family: sans-serif;
        display: block;
        }

article {
        width: 40%;
        height: 300px;
        margin: 0 auto;
        float: left;
}


section article img { 
                    margin: 5%;
}

.logogrupal{ 
        width: 20%;
        padding-left: 39%;
        padding-top: 2%;
     }

footer{ 
        height: 50px;
        background: #fff;
        font-family:  sans-serif;
        font-size: 0.65rem;
        text-align: center;
        padding: 20px;
        box-shadow: 0.1rem 0.2rem 0.3rem 0.5rem rgba(204, 204, 204, 0.35);
}


/* responsive */

@media screen and (max-width:768px){
    
.logogrupal{
    width: 40%;
}
    
header {
    padding: 10%;
    width: 80%;
    height: 90px;
}
    

nav{ 
    width: 100%;
    height: 200px;
}

nav li{
    width: 100%;
}


article{
    width: 45%;
    height: 400px;
    
}
    
footer{ 
    display: none; 
}
}