When you add a widget to a LayoutPanel, it takes up all the space unless you
specify it's position (see below). Also, you can add only one widget to the
RootLayoutPage. You can't add an image directly to it, unless your entire app
consists of this image and nothing else.
So, try this:
img.setSize("12px", "12px");
LayoutPanel panel = new LayoutPanel();
panel.add(img);
panel.setWidgetTopHeight(img, 100, Unit.PX, 12, Unit.PX);
panel.setWidgetLeftWidth(img, 100, Unit.PX, 12, Unit.PX);
RootLayoutPanel.get().add(panel);
Alternatively, you can use a FlowPanel and set CSS style on the image, as you
tried, and then add this FlowPanel to the root.
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