how to show something which is out of page.

[gutterleech]

I created a website for some one.
www.eco-cleaning.org.uk

She want me to create a border on the top of the page which stretches outside the page. As per my experience with XWD, it doesnt show anything which is outside the page. So, how am I gonna accomplish it??
Please check the picture for the thing she want me to do. and the website to see what i created.

Thank you.