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Scrollable container or lightbox image?

I have to put a few very long web pages into my portfolio, but would rather not make people scroll through them if it’s not necessary. Is it possible to make some kind of container for them that can be scrolled separately so it doesn’t take as much vertical space on the page? Or, better yet, to make the lightbox images scrollable? Right now they are made to fit into the viewport, which makes the details way to small to see.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)