sticky list headers design
Squashed 'libs/sticky-list-headers/' changes from 355d2ec..fb2b52a

fb2b52a bug fix for browser that does not support nth-of-type query selector

git-subtree-dir: libs/sticky-list-headers
git-subtree-split: fb2b52ad3562d57a5b77285bab741b8e9f6418e8
Merge commit '5bac9621e8cadf283d22420bfe53e9fdbfa33660'
browsers that are not supporting nth-of-type query selector