Hello AS

I have the following problem on my website. http://www.dezwolseoogarts.nl

If visitors of my website want to print a topic, they click on the print button.
A small screen will appear, and they must press the print button again.
However, the print button is outside the screen, and that's confusing.
Is there a way to set up this screenoptions ?
Where can I find these settings?
The width of the screen is 640 and I want to adjust to 850.
I cannot find a print.css or something like that

I hope You can help me with this problem.

Yours sincerely

Frans de Vries