// * To get the current size of the Stage, you can query the contentRectangle property
Rectangle stageRect = stage.contentRectangle;
print("stage.contentRectangle: ${stageRect}");
stage.contentRectangle: Rectangle<num> [left=-0.0, top=-0.0, width=740, height=370]
this is what is returned by the print statement above. Even though this isn't the size I've given the stage in the CSS file