Rollup merge of #56959 - JohnHeitmann:mobile-z-fix, r=GuillaumeGomez

Fix mobile menu rendering collision with tooltip.

Bring the mobile-mode menu in front of the ⓘ icon.

Here's what the bug looks like:

![screen shot 2018-12-18 at 1 53 46 pm](https://user-images.githubusercontent.com/4282480/50185501-cbf62180-02cc-11e9-927e-3c6469901323.png)
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Pietro Albini 2018-12-19 11:47:23 +01:00 committed by GitHub
commit 1ba6ec4a32
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@ -997,7 +997,7 @@ span.since {
margin-left: -15px;
padding: 0 15px;
position: static;
z-index: 1;
z-index: 11;
}
.sidebar > .location {