Okies, there are two options here to fix --

1. we can set the overflow of the preview box to scroll, so it scrolls verticalay when longer than the heihgt. or
2. we can make the preview the whole higght

i am leaning towards #2 here.

the second approach sounds good, maybe with a max-height or so and then vertical scrolling? :)

Just submitted a PR for this:
https://pagure.io/pagure/pull-request/758

went with just making the preview box fit the content, as we don't show a scrollbar on a comment when we show it for real, so scrolling the content here seemed a bit strnage.

Commit 78efbe0 fixes this issue