Half-screen option?

[StachuDotNet]

Is there a smart way, in md, to specify that you want half of the screen to show a code block in 1/2 of the screen?

Specifically, I'm interested in showing C# next to F#. With reveal.js directly, I've been just manually doing some width:50% and float:left/right magic, but not sure how to represent this in md to submit a PR.
I'm willing to work on this idea, but wanted some input as to how this might be done, if it's a common case (and if not, how I can do it locally without a PR!)