Disable margin top for certain resolutions

Hi,

Always been a fan of this plugin, will definitely send you a buck whenever I finally start making any money back out of my sites.

I was wondering if there is a way to disable margin-top at certain resolutions such as at laptop resolution of 1366×768. I currently use a 140px margin top for an adsense placement that looks fine at 1080p, but when going down to laptop res, it appears at the bottom of the frame and I don’t want to disable the entire plugin at this resolution as the advert is still out of frame at the top of the screen when I scroll down to the main content on the site. I do have a temporary fix of placing the widget manually by the main content, but I’m still missing out on being able to scroll through the entire page with a fixed widget which at 768p, the 700px adsense normally fills out the side of the screen perfectly. A css solution is preferable, I’ve tried messing around myself but no luck, hopefully someone can point me in the right direction.

Regards, Sam