The W3C CSS validator throws `Value Error : border Too many values or values are not recognized : solid #626E82 1px 0`* `.phui-timeline-preview-header` has never been used since introduction in rPdb66cd830d1b.
The zero value seems to be a copy-and-paste-error. See https://developer.mozilla.org/en-US/docs/Web/CSS/border* Only use of `.phui-timeline-change-details` was removed in direct followup rP4e8e035de006.