body {
    color: #444444;
    background-color: #EEEEEE;
    font-family: 'Trebuchet MS', sans-serif;
    font-size: 80%;
    margin: 0;
}

h1 {
    margin: 0;
}

#page {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100vh;
    background-image: url(http://edimago.it/verona-min.jpeg);
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}

.header { 
    text-align: center;
    width: 600px;
    color: rgba(0,0,0,0.7);
    font-size: 1.2em;
    border-radius: 5px;
    line-height: 3em;
    padding: 100px;
    background: rgba(255,255,255,0.5);
}

#content {
    padding: 4px 0 24px 0;
}

#footer {
    color: #666666;
    background: #f9f9f9;
    padding: 10px 20px;
    border-top: 5px #efefef solid;
    font-size: 0.8em;
    text-align: center;
}

#footer a {
    color: #999999;
}

@media (max-width: 768px) {
    #page {
        background-position: center center;
    }

    .header {
        font-size: 0.9em;
        padding: 50px;
        width: 400px;
    }
}

@media (max-width: 425px) {
    .header {
        font-size: 0.7em;
        padding: 30px;
        width: 220px;
    }
}