How to get rid off white spaces around window

[srikanthn]

Hi all

I have created a window as shown in attachment.
I am getting white border around it .
how to get rid off that problem.
When i remove width:some px attribute.I am getting window with no whitespaces but it is getting resized automatically when user drags it.

[Excavator]

Hi srikanthn,
We'll need to see your code. Would only be guessing otherwise.