Suggestion: Improved visibility of the stun bar on rares/bosses

I have found it difficult to quickly get a sense of how far I am, whilst fighting a rare or boss, from filling the "stun bar" to stun it. This because while the filled part of the bar is visible in a good way - the background of the unfilled portion tends to "drown" in the surrounding UI elements and background (which is often dark).

Thus, an issue for me has been to quickly see the endpoint of the bar that is filling up, and thus difficult for me to get a sense of how far off or close I am to stunning the enemy.

I suggest making this more visible, and I made some quick mockups as suggestions (see the link below). Suggestion 1 is to make an outline of the entire bar, thus showing its bounds. Suggestion 2 is to mark the endpoints of the bar, I made "dots" in the mockup, but this could potentially be some nice gold clasp thing - as on the big HP bar.

My suggestions: https://imgur.com/a/AfzZbmr