Jonas Jenwald 1b6a83da4a Simplify the thumbnail styling in the viewer
This patch tries to simplify, and improve, the thumbnail styling:
 - For rendered thumbnails there's one less DOM-element per thumbnail, which can't hurt in longer documents.
 - Use CSS-variables to set the dimensions of all relevant DOM-elements at once.
 - Simplify the visual styling of the thumbnails, e.g. remove the border since the viewer no longer has visible borders around pages, since the relevant CSS-rules are quite old code.
   These changes also, at least in my opinion, makes the relevant CSS-rules much easier to understand and work with.
 - Make it easier to work on e.g. [bug 1690428](https://bugzilla.mozilla.org/show_bug.cgi?id=1690428) without affecting the other sidebarViews.
2023-05-04 12:17:49 +02:00
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