header {clear: both;
    top: 2%;
    height: 20%;
    width: 85%;
}
    
nav {position: relative;
    display: inline-block;
    width: 20%;
    height: 75%;
    overflow: auto;
}
    
section {position: relative;
    display: block;
    width: 75%;
    float: right;
    padding: 20px;
}
    
footer {margin-top: -50px;
    height: 5%; 
    padding:5px 0px;
    clear: both;
}

#letras{position: absolute; 
    width: 20%; 
    left: 40%;
}

#silueta{position: relative;
    left: 65%;
    width: 35%;
    bottom: 50px;
}

form{width: 44%;}

#imagenizq{float: left; 
    width: 20%; 
    margin-right: 15px;
    margin-top: 10px;
    margin-bottom: 10px;
}

#imagender{float: right; 
    width: 20%; 
    margin-left: 15px;
    margin-top: 10px;
    margin-bottom: 10px;
}
   


h2{position: fixed;
     top: 88%;
    left: 19%;
}