ContentTranslation's sticky translation filter currently stays flat in visual terms, while it's position: sticky.
It should feature a one-sided, bottom box-shadow to emphasize scrollability of content underneath. On GUI systems like macOS, with hidden scrollbars, that's an additional hint for better discoverability.
Also it's in line with our default approach where to use drop shadows and with the card-like appearance of “Need help translating” aside.
|Status||Proposed||Proposed while scrolling|