I need to create a responsive site with thumbnail images. Click a thumbnail and it opens up a pop-up with more thumbnails each linking to a page. I used pop box magic Lightbox but had issues when I tried to create space between the thumbnails inside the pop-up. I tried using a 5 px margin but when the screen is narrow I can't scroll to the top of the box to close the pop-up and the top half of the first thumbnail is missing. Also because of the width it's almost impossible to click outside the box to close it.
Is pop box magic the best tool for this job or is there another way to go? If it is how to to fix the scrolling/space problem. Thanks.