Adjust colors in wp_die() and install.css.

Missed in [26788] and [26837], see #25858.
fixes #27589.
Built from https://develop.svn.wordpress.org/trunk@27855


git-svn-id: http://core.svn.wordpress.org/trunk@27686 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Style "Cheatin’ uh?" message like wp_die().

props jackreichert.
fixes #27490
Built from https://develop.svn.wordpress.org/trunk@27856


git-svn-id: http://core.svn.wordpress.org/trunk@27687 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor:
- Use standard button styles for the Quicktags buttons.
- Better style for the TinyMCE buttons (hover/focus/active/disabled).
- Move the fullscreen (DFW) button to the right.
- Better style for the Visual/Text buttons in DFW.
Props avryl, see #27279
Built from https://develop.svn.wordpress.org/trunk@27857


git-svn-id: http://core.svn.wordpress.org/trunk@27688 1a063a9b-81f0-0310-95a4-ce76da25c4cd