Notes container does not have min height
Notes container does not have min height

Section and chapter note <article> element does not have min height
because we are seeing gaps when there isn't too much content in notes.

https://www.pivotaltracker.com/story/show/60504050

alphagov/trade-tariff-frontend,bitzesty/trade-tariff-frontend,bitzesty/trade-tariff-frontend,alphagov/trade-tariff-frontend,bitzesty/trade-tariff-frontend,alphagov/trade-tariff-frontend,bitzesty/trade-tariff-frontend,alphagov/trade-tariff-frontend