Heatmap alignment

Awesome plugin! It does the job.

I am wondering how the heatmap overlay aligns to the browser viewport. My design is a fixed-with “centered” design. So when I am viewing my heatmap, should I resize the browser window so that the upper left corner of the design is flush with that of the viewport?

http://ww.wp.xz.cn/extend/plugins/wp-super-heatmap/

EDIT: Here’s my website for reference: http://www.audiomuse.ca