by joachim: Removed obsolete messages region and mention of messages region in docs.
by joachim: Removed obsolete messages variable and mention of messages region in docs.
Issue #2465869 by joachim: Moved styling for header menus from the ULs to the regions.
by joachim: Changed shadow at bottom of header to be made with CSS box-shadow rather than background gradient, to allow the header to change its height.
Issue #2465605 by joachim: Changed page layout to use flexbox; replaced background images with CSS gradients and box-shadows.
by joachim: Fixed position of logo due to new SVG file not including any padding.
Issue #2465599 by joachim: Added rules for form styling that have gone from core.
Issue #2465597 by joachim: Fixed rules for user login block are also hitting the full page form.
by joachim: Fixed colour of rows on status report admin page.
Issue #2465305 by joachim: Fixed node author picture not showing.
Issue #2464999 by joachim: Fixed bullets not showing on menu links in sidebars.
Issue #2464991 by joachim: Fixed primary and secondary nav are now regions.
Issue #2464735 by joachim: Fixed messages are now in a region.
Issue #2393419 by joachim: Removed unused CSS rule for system status table.
Issue #2384513 by joachim: Moved stylesheets to a css subfolder.
Updated CSS image paths.
Moved CSS files; updated libraries.yml.
Issue #2403795 by joachim: Changed breadcrumb to use breadcrumb region.
Issue #2461711 by joachim: Changed logo to SVG format.
Issue #2461887 by joachim: Added Classy theme as base theme.
Issue #2414701 by andrewmacpherson: Removed package info from .info file.
Issue #2282365 by joachim: Converted fieldset styling to details.
Issue #2400681 by joachim: Fixed dropbuttons with only a single item are too big.
Issue #2396551 by joachim: Removed IE7 *:first-child+html CSS hack.
Issue #2396531 by joachim: Fixed gap to the left of vertical tabs groups.
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