Improve `p` print margin handling

[Elliott Plack]

I have fiddled with the print settings in Chrome but am unable to get the slides to consistently stay on one page. Consider an enhancement to improve how the print view works.

Here's an example of how various tweaks to the print settings do not produce a clean result.

[Brooks Becton]

Hey! I added this line to the internal styles on the demo.html

        div {
            page-break-after: always;
        }

Then in Chrome, I was able to change orientation to landscape and set scale to 200 and got this

It's not exactly center but is this something you are looking for?

[Elliott Plack]

@brooksbecton This approach looks great and would certainly meet my use-case. Is there a branch where I can test it out?

[Brooks Becton]

@talllguy

I made PR for these changes and my branch can be found here: https://github.com/brooksbecton/big/tree/feature/seperatePrintSlides

[Elliott Plack]

Tested the update. It works great!

One drawback is that you cannot have multiple slides per printed page. If that is a non-issue, then we can close this.