I'd rather not have embedded styles for this on every page, especially since they'll not be used on mobile. How about customizing pamflet-grid.css? Maybe we append a templatized block to the end of the static source file?

The easier thing would be to not specify this height, and just have it be calculated on text plus margins. I guess css wasn't having that. But if we're going to start supporting customizations like this I think it's worth finding a way to get it into the css sources, for efficiency.