[wp-trac] [WordPress Trac] #39970: Improve the "dismiss notice" button color contrast

[WordPress Trac]

#39970: Improve the "dismiss notice" button color contrast
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 Reporter:  afercia                              |       Owner:
     Type:  defect (bug)                         |  rianrietveld
 Priority:  normal                               |      Status:  assigned
Component:  Administration                       |   Milestone:  4.8
 Severity:  normal                               |     Version:
 Keywords:  has-screenshots color-contrast       |  Resolution:
  good-first-bug has-patch                       |     Focuses:  ui,
                                                 |  accessibility
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Comment (by afercia):

 Refreshed patch to apply cleanly from the root. Also adds hover/focus
 style for the media upload "dismiss error" button.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39970#comment:8>
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