body {
    text-align: center;
    font-family: Verdana, Geneva, Arial, Helvetica, sans-serif;
    font-size: 62.5%;
    background: #333 url("../images/fondo_clases_particulares_cadiz.jpg");
    background-repeat: no-repeat;
    background-position: top center; 
    margin: 0;
}
 
div#contenedor {
    visibility: visible;
    text-align: left;
    width: 900px;
    height: 700px;
    margin: 0 auto;
    background: url("../images/clases_particulares_cadiz.jpg");
    background-repeat: no-repeat;
}

div#formulario {
    padding: 105px 20px 20px 60px;
    width: 400px;
}

img {
    border:0;
}

label { font-weight: bold; }