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The original `ProgressBar`-functionality is very old, and could thus do with some general clean-up. In particular, while it currently accepts various options those have never really been used in either the default viewer or in any examples. The sort of "styling" that these options provided are *much better*, not to mention simpler, done directly with CSS rules. As part of these changes, the "progress" is now updated using CSS variables rather than by directly modifying the `style` of DOM elements. This should hopefully simplify future changes to this code, see e.g. PR 14898. Finally, this also fixes a couple of other small things in the "mobile viewer" example.