fix(overlay): raise z-index for overlay-container

[jelbourn]

R: @kara
This will help prevent the overlay container from being covered up by other stacking contexts that are directly on the document body.

(of course there's always a higher z-index...)

[fxck]

I hope this is not a replacement for #1584 (comment)

Otherwise good luck this that https://github.com/search?utf8=%E2%9C%93&q=%22z-index%3A+9999%22&type=Code&ref=searchresults ..

[jelbourn]

Not a replacement, but should generally make things better. Though, I still don't want to remove this z-index in #1584 because it's important that the overlay container always create a new stacking context.

[fxck]

Read the comment. I agree, I proposed moving the custom class from pane to container as well as changing z-indexes similar to what you just did.

[kara]

LGTM

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