Edit in JSFiddle

window.onload = function() {

    $("canvas").attr({height:$("#wrapper").height()});
    $("canvas").attr({width:$("#wrapper").width()});

    var stage = new Stage($("canvas")[0]);
    var g = new Graphics();
    
    //カラーコードで指定
    g.beginFill("#800000");
    g.drawCircle(-150,0,30);
    
    //カラーネームで指定で指定
    g.beginFill("black");
    g.drawCircle(-100,0,30);

    //RGB名前空間をべた書きで使用
    g.beginFill("rgba(100,200,0,0.5)");
    g.drawCircle(-50,0,30);    
    
    //RGB名前空間を使用
    g.beginFill(Graphics.getRGB(220,0,50,0.5));
    g.drawCircle(0,0,30);
    
    //HSL名前空間を使用
    g.beginFill(Graphics.getHSL(180,50,50,0.5));
    g.drawCircle(50,0,30);
    
    var s = new Shape(g);
    s.x = $(window).width()/2;
    s.y = $(window).height()/2;
    
    stage.addChild(s);   
    stage.update();

}

<div id="wrapper">
<canvas></canvas>
</div>

html{
    min-height: 100%;
    overflow: auto;
    position:relative;
    z-index: 1;
}

body{
    min-height: 100%;
    margin: 0;
    padding: 0;
    overflow: auto;
    position: relative;
    z-index: 1;
}

#wrapper{
    height: auto;
    overflow: auto;
    position: fixed;
    z-index: 1;
    width: 100%;
    height:100%;
    min-height:100%;
}

canvas{
    position: fixed;
}