body {
    background-image: url(http://www.eficienciaysostenibilidad.com/img/fondo.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    color: white;
    font-family: 'Lato', sans-serif;
    background-color: #22313F;
}
table.center {
    margin-left:auto; 
    margin-right:auto;
}
td.titulo {
    padding: 20px;
    text-align: center;
}
td.fondo {
    padding: 40px;
    text-align: center;
}
td.caja {
    border-radius: 50%;
    background: #81846C;
    color: #FFFFFF;
    border: 0px;
    padding: 20px; 
    width: 100px;
    height: 100px;
    text-align: center;
}
td.cajados {
    border-radius: 50%;
    background: #6C7A89;
    color: #FFFFFF;
    border: 0px;
    padding: 20px; 
    width: 100px;
    height: 100px;
    text-align: center;
}
td.caja:hover {
    cursor: pointer;
    opacity: 0.5;
}
td.cajados:hover {
    cursor: pointer;
    opacity: 0.5;
}
img {
    border:none;
}
a.idioma:link {
    text-decoration: none;
    color: #FFFFFF;
}
a.idioma:visited {
    text-decoration: none;
    color: #FFFFFF;
}
a.idioma:hover {
    text-decoration: none;
    color: #e0ac69;
}
a.idioma:active {
    text-decoration: none;
    color: #e0ac69;
}
table {
    width: 800px;
}
h1 {
    font-family: 'Lato'; font-weight: 300;
    font-size: 3.0em;
}
h2 {
    font-family: 'Lato'; font-weight: 300;
    font-size: 1.25em;
}
h3 {
    font-family: 'Lato'; font-weight: 300;
    font-size: 2.0em;
}
h4 {
    font-family: 'Lato'; font-weight: 100;
    font-size: 1.0em;
}