can not see full background image

[mazluta]

The demo shows exactly as you ask yet you seem reluctant to look. This is the starting place for your answer and likely will completely answer it.

want it be more simple to say.
1.put control on the form.
2. attach the form stylesheet to any css file.
3. in the css let any style its tag name.
4. connect the control to the tag name in the css property.

i think that will be answer.
a specially if there is no arranged document