Navigation Search Background

For text color and background color:
Go to Customizer > Colors > Primary Navigation > Navigation Search.

For the active search bar background color:
Go to Customizer > Additional CSS. Find the css start with this selector .navigation-search.nav-search-active, change the color code there.
https://www.screencast.com/t/0aeMdHyADC

For font and border try this CSS.

.navigation-search input[type="search"] {
    font-family: 'dashicons';
    border: 2px solid #FFF;
}

Let me know :)

I swear I look and look.... getting cross-eyed and still can not find it :)

Not easy I would say :)
You found them now?

yes. Thank you for the assist.

You are welcome :)