html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

var stage = acgraph.create('container');

​

var rectangle = stage.rect(0, 0, stage.width() / 3, stage.height() / 2);

​

// Creates radial gradient.

rectangle.fill(['#212121', '#FAFAFA'], 0.5, 0.5, null, 1, 0.23, 0.81, 45, true);