#forpera {
    background-image: url(forpera.png);
    background-size: 700px;
    width: 100%;
    height: 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-color: #ffffff;
}

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}