Created by: pvdlg
Fixes #21605 (closed) and fixes #21590 (closed).
At the smallest breakpoint the container has no with set. In the case of a container within a navbar, due to margin-right: auto and margin-left: auto the container content is coalesced toward the center.
This issue happen only in Chrome (see http://jsfiddle.net/rLqtw01t/ in chrome on xs viewport with and in another browser).
This PR set margin-right: 0 and margin-left: 0 for container within navbar under xs viewport width to avoid the issue.