Analogus, thanks a lot for your answer. For some reasons it still doesn't work for me, even though the extern.css you posted contains both "body" and ".calibre" tags (those are the only tags addressed in my css file which works for me (to specify a fixed line-height)). When I press a line-height button, it turns black and nothing happens (the same for fine font size). Something strange is going on. (My "use external file for css-tags" option is "yes", and I tried several of the css files you provided (such as CharisSIL.css))
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