hm... since you are talking about a height measurement and not a width measurement, try your same css but use the unit "ex". "em" is the width of the letter "m" in whatever font / size you are using ; "ex" is the height of the letter x in whatever font / size you are using.
so :
p {
margin-top: 1.2ex
}
also, to check if it's working, try with some outrageous value like 5ex ; then you are sure to see a difference, and you can refine it later to find the value you like.
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