volume slider very "small"

The volume slider in the window of a participant is very small (only a few pixel wide) and not really visible. see screenshot. 

Reason seems to be the class "dropright" which is added to the  HTML-element

<span id="volume-218972b0-f470-46d4-8d4a-7db1f87c400a" class="om-icon dropdown dropright volume-control align-right"><span id="volume-218972b0-f470-46d4-8d4a-7db1f87c400a" class="om-icon dropdown volume-control align-right">
....
</span>

When this class is removed, it looks like

I think this is the way it was planed.

Another way could be to modify the  class dropright.