body {
 background: white;
 color: black;
}

div.frame {
 margin-left: 10px;
 position: relative;
 width: 650px;
 height: 550px;
}

div.spacewar {
 position: absolute;
 width: 650px;
 height: 550px;
 overflow: hidden;
}

canvas.spacewar {
 background: black;
 position: absolute;
 width: 550px;
 height: 550px;
 top: 0px;
 left: 100px;
}