There is a semicolon missing at line 38 in MemoryTimelineOverviewGraph.css.
Pull request: https://github.com/WebKit/WebKit/pull/29125
Created attachment 471515 [details] screenshot of what should look like
Created attachment 471516 [details] screenshot of bug
Committed 279340@main (d8fda146dfed): <https://commits.webkit.org/279340@main> Reviewed commits have been landed. Closing PR #29125 and removing active labels.
<rdar://problem/128781781>