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Font sizing ems (relative) requires a nominal static base font size. This tames browser markup and keeps your cloud inside it’s expected page display space. There may be browser idiosyncracy involved in body vs. cloud tag application of the static font size. I always stick base font size in the html body attributes string.
A good idea already commented is to label your size styles with numbers, even the numerical values that size your type in say ems. This might help also if your cloud moves from a presentational hack to a local web real-time page access display.
Now, if your base font size is 16px then 0.5em through 1.5em (or whatever increment you choose) can represent a 1-10 scale of cloud tag appreciation. Also, you can now shape your cloud size (line-height, etc) with greater accuracy.