html, body, #contenedor, .center {
    position: relative;
    width: 100%;
    height: 100%;
    margin: 0;
}

body {
    background: url(../img/fondo.jpg) no-repeat center center;
    background-size: cover;
    font-family: 'PT Sans', sans-serif;
    color: white;
}

.center {
    text-align: center;
    display:table-cell;
    vertical-align:middle;
    float:none;
}

#contenedor {
    display: table;
}

footer {
    position: absolute;
    width: 100%;
    bottom: 3%;
    left: 0;
    box-sizing: border-box;
    padding: 0 2.5%;
}

footer a:last-child {
    float: right;
}

p {
    font-size: 3.7em;
    margin-top: -4.5%;
}

a {
    color: inherit;
    font-size: 2em;
    text-decoration: none;
    /*opacity: 0.4;*/
}

a:hover {
    color: #dedede;
}

@media (max-width: 767px) {
    html, body {
        font-size: 12px;
    }
}

@media (max-width: 481px) {
    html, body {
        font-size: 10px;
    }
}

@media (max-width: 321px) {
    html, body {
        font-size: 9px;
    }
}