body {
    background-color: rgb(180, 180, 180);
    margin: 0;
    overflow: hidden;
    font-family: arial, helvetica, sans-serif;
    background-image: url(image/background.png);
    background-repeat: no-repeat;
    background-position: 50% 50%;
}

#main {
    width: 100%;
    height: 100%;
}

#debug {
    position: absolute;
    left: 10px;
    top: 10px;
    font-weight: bold;
    font-size: 15px;
    width: 300px;
    height: 150px;
    padding: 20px;
    background-color: #ffffff;
    z-index: 100;
    opacity: .8;
}