[#16209] SASS fixes for breadcrumbs
[#16209] SASS fixes menu active trail states and borders
[#16209] SASS fix for incorrectly specified font-family on blocks
[#16209] SASS correction for poorly written selector
[#16209] SASS fix for heading colours and sizes (inc. blog posts)
[#16209] SASS fix for borders on various page elements (inc. panels, views, beans)
[#16209] CSS follow-up to branch