Jonas Jenwald f9262d29fc Clean-up some CSS rules for the various toolbar separators
This re-factors the various toolbar separators to *explicitly* specify both their dimensions and margins. Also, for the `horizontalToolbarSeparator`-class we can just set the `background-color` rather than using `border-top`.

Note that the `splitToolbarButtonSeparator`-class currently sets a number of unnecessary CSS rules, since as mentioned by the Firefox Devtools both the `display`- and `z-index`-properties are being ignored because `float` is used.

Finally, there's also no need to set a `z-index` for some of the `:hover`-rules. It's possible that this *was* necessary before the re-design, since the buttons had borders then.
2022-04-25 14:53:12 +02:00
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