Your Q style looks like it contains alot of unnecessary bloat. It contains alot of
mso-style- attributes which cannot be interpreted by most readers and could cause problems. You really need to clean out that html file in Sigil.
You could try running
CustomCleanerPlus Sigil plugin which will get rid of all mso-style- bloated code(and do much more) from the stylesheet and html code. This plugin cleans out both epubs and Word html as well as html docs from other sources. Just click the link below to download the zip file for Sigil install. All instructions are in the release notes. See link below:
CustomCleanerPlus Sigil Plugin