theming.md: bring `:root` up to par with Scss. (#29323)
Also, add a warning in _root.scss so that we don't miss it again.
X
XhmikosR committed
84cba07246f935ed43e8e7a1b000ef32febf333f
Parent: 1d69e6c
Committed by GitHub <noreply@github.com>
on 8/29/2019, 8:10:06 AM