I can improve the layout somewhat by fiddling with the top and left values, but I can never get it “just right”.
It seems I have to choose between clipping part of the screenshot or not covering the area fully. I have gone for a little bit of clipping at the moment as it’s the least bad option, visually.
I suggest you work on improving this for the next version of the template. App startups need pixel-perfect product presentations.
It’s the single most important area of the entire web site.