Using rem (relative em) for font-sizing would probably help. Not everyone is still using 1024x768 resolution (11px was most commonly used at that time).
I am at a high-dpi screen myself, but I'll have a look at switching to rem.
I found that just deleting all of the font-size and line-height css rules made the page much more usable. Let the browser's defaults take care of that. Use relative font-sizes if you must on board names to make them larger, but it's probably not necessary. For the menus, leave them at the default font size or make them _slightly_ smaller.
Hitting `ctrl/cmd +` solves that whole issue for you. But I am sure you already know that.