Ayu theme search bar color is not quite comfort

[tesuji]

I was excited to try out the new Ayu them in rustdoc.
But I find that the background color of search bar is quite dark.
I would like to change its background to #424242.
This color is the same as background color of search bar in mdbook Ayu theme .

The expected result after color changed:

@rustbot modify labels: T-rustdoc

[tesuji]

cc @Cldfire, feel free to ignore if you aren't interested.

[Cldfire]

Good point, the search bar could probably benefit from a more prominent color.

I'll take a look at it tomorrow 👍

[tesuji]

@Aloso is resolving the issue in #74371 .

[tesuji]

Closed by #74371 .