Issue #2972451: Focused/hovered tabs do not meet WCAG AA 1.4.3 for contrast

Alberto Padernorequested to merge
cherry-pick-599ff843 into 2.0.x

(cherry picked from commit 599ff843)

0f276a00 Issue #2972451: Focused/hovered tabs do not meet WCAG AA 1.4.3 for contrast 6b932f18 Used double colon pseudo-element notation

Co-authored-by: Alberto Paderno 22536-avpaderno@users.noreply.drupalcode.org

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