Thank you very much for your help.
@BetterRead : Sorry but I don't find these settings! Can you tell me where to find it and what version do you use please?
@PeterT : The only error reported by Calibre is that the file is too big. I'll try to split it during conversion in Sigil.
@theducks : My css files passed the W3C quality control.
I continue my investigations.
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