No, the code you provided works on yours eventually but it’s not working on mine. The line is not showing under header on my mobile
Topic summary
Goal: show a thin bottom border under the header on mobile in the Publisher theme. Desktop already has a border via CSS.
Initial fixes suggested: add a mobile media query targeting the header wrapper and set a 1px solid bottom border. Instructions: edit base.css/theme.css and append the rule for screens ≤767–768px. Screenshots were shared to show the expected result.
Issue persists: the border appears for the helper but not on the original store’s mobile view. The requester confirmed the desired placement directly under the header and reported it still doesn’t show.
Refined fix: use a more specific selector for the sticky header (including its color-scheme/gradient classes) and increase the breakpoint to ≤989px to ensure it applies on mobile/tablet. This aims to override theme styles that may be preventing the border from rendering.
Notes: Code snippets and screenshots are central to understanding the issue and proposed solution. Status: unresolved; awaiting confirmation whether the more specific CSS resolves it on the requester’s store.