/* Styling for the shared header and footer that scripts/inject-chrome.js
 * writes into every page taking them.
 *
 * Split out of tools/_shared/flow.css, which is where #mainNav lived and which
 * only three of the 53 in-scope pages link. Injecting the header without this
 * file would have shipped unstyled markup onto 25 insights pages. It is linked
 * by the head partial, so every page that takes chrome also gets the styling
 * for it.
 *
 * Filled in at Task 7, and deliberately empty until then so that the head
 * partial links a file which resolves rather than one that 404s.
 */