Yes it was. It is a XenForo config item that must be set for each theme outside of the CSS adjustments that I make. Right after you suggested a bad source (url) I realized what was likely the issue but had avoided. Now fixed. I also scaled it down a little and it might be slightly less bright, and has a drop shadow.
Thanks for pointing this out. It is another feature I do not use. In the XenForo config settings for this theme, I set ALL of the colors to blue. So, when this sort of thing occurs, I can very easily notice where I must add some CSS. There is also the side-effect of when I botch something in the CSS which breaks it, and then the whole thing is blue. There are a couple things I might keep blue but this one was unforeseen.
Since the majority of the changes in this theme are for colors rather than positions, the config to all blue is helpful. I intend little blue, certainly most mouse-overs will be changed. Anything that remains blue on blue will be fixed. I can beat these items into shape after work, sometime around 2am at the soonest. If there are others, especially things that appear while using a smartphone, it would help to be reminded of them. Thank you.
I have recently realized that there is no indicator once the headers are sticky (the top forum bar with links including 'Documentation') if using the New Style, or that also include the section with the 'FreeNAS.org' link.
My plan is to have the breadcrumbs not to also become sticky, because this makes a very large top header that reduces viewing size for messages or editing, but to hopefully shift it onto one of the other two sections, where space permits. If not entire breadcrumbs, then at least the current forum name, such as "Ganz großes Kino theme" - Discussion, Comments, Requests while viewing this message for example. Other long-winded discussions with multiple posts and possibly imperfect topic control (at times) make it very difficult to know which forum one is reading simply by message context.
For those admins and moderators who happen to use the Ganz großes Kino theme they will notice that the staff bar will have its contents shift to the sticky menubar beside 'members' item. This is a really cool feature that IMHO makes little sense why it would be permitted to hide, wouldn't a mod want to be able to act as quick as possible? This is the concept I want to implement for the breadcrumbs. Now that I succeeded with this feature, the breadcrumbs should be just as easy to accomplish.
The advantage of this over the prior minor shift and sticky, is that the staff bar content (buttons etc) will not obstruct any other buttons. In addition to this, by being included with the menu buttons, a narrow screen will cause it to hide within a scrollable space but remain accessible.
Sorry folks, some things have gotten broken in my attempts to make the changes more portable. The staffbar buttons seem to be always visible, the breadcrumbs do not appear. I'm hacking away at it, trying to solve these things and get back the spiffy changes I had. I want some sort of portable or minimal change method like a function call (ie, macro) or widget so that these can very easily be incorporated.