[franklekens]

Thanks. Of course, it's so obvious, now I see. When I compare with a similar file where all goes right, I see at the top of each xhtml file:

<link href="css/template.css" rel="stylesheet" type="text/css" />

That's what you mean, right? I'll go see if I can achieve that in Sigil without having to add it on each page manually. Otherways, maybe I'll just do that.

Now I'm going to have a look at the OUP file as well. Although there the problem is probably different.

Edit: YES! It's really simple in Sigil. Select all the files, right click, and then "link stylesheet". That solves it. Thanks a lot.