title: How to replace container class in react-bootstrap
body: <p>I've installed react-bootstrap, and have proven I can use the grid components which is my primary need.  But why is "Container" not found, and how should I wrap my outermost content so that my page has margins and whatever else is normally set by bootstrap?</p>
  
  <p>I understand that I can use regular CSS, but (a) wouldn't a Container be cleaner to match the bootstrap within, and (b) what else should be there, beside margins, to wrap all the inner stuff and still have it work well?</p>