*
{
    margin: 0;
    padding: 0;
}

body
{
    overflow: hidden;
}

div
{
    position: absolute;
}

#game-container
{
    width:400px;
    height: 320px;
    
    top:50%;
    left:50%;
    
    margin-top: -160px;
    margin-left: -200px;
    
    background-color: #999;
}