Fix line width which separating the timeline events
requested to merge gitlab-community/gitlab:389244_Incident_timeline_separator_ends_early into master
What does this MR do and why?
Current MR is refreshing the stale !133173 (closed). Basically to fix the separator line it adds some css mentioned by @psjakubowska here !133173 (comment 1599253291).
Closes: #389244 (closed)
Changelog: fixed
Screenshots or screen recordings
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