Squashed 'app/' changes from f809920..9223ef1

9223ef1 added verbose selector to clearfix rules

git-subtree-dir: app
git-subtree-split: 9223ef14fddbf87fc24fc6e94dcb5e69074d2e60
Merge commit '218e777ba98e7a61bc5f443f5e626075af9fa488'