The search box does not match the other UI style (BB-10284)

Hey,
it's just a small thing, but the search box in the header does not match all other input elements. Normaly Bitbucket has just a small rounded corner, but that search field is huge.

If you remove border-radius: 5em; from the style, it would look much better.
I added you a before and after screenshot.

Greetings
Leo