Visual issue where header background is cut for small screens.

[akoppela]

trafficstars

There is an issue with header for small screens. Where grey background is cut.

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[akoppela]

PR created https://github.com/elm-lang/package.elm-lang.org/pull/241