OP is from France. But, according to MY French the French for "police" is "police".
OK, OK, OK, I chose the wrong word, but it was corrected by GrumpyMonkey as soon as the first reply:
If I understand you correctly, you mean to say that the HTML displays different font sizes than the ones in Evernote.
I also just fixed the topic title and the initial post, so could we, please, now stick to the actual issue? ;-) Thanks.