body,html {
 background-color: #d2d2d2;
 height: 100%;
 margin: 0;
 padding: 0;
}

#flash {
        width:200px;
        height:300px;
        position:absolute;
        top:50%;
        left:50%;
        margin-left: -500px;
        margin-top: -330px;
}