Windows 10: language task bar cruiser is white how do i change that mercy me pls?

I did change something to white in the previouse days but I don't know what to white i did change so the cruiser of the langauge bar everytime in chrome and even in writing is white plse bring to black the description is in the picture at the first second becomes white then turn back to black

:)

 

White Task Bar

Hello Microsoft

Can you take back the TASK BAR TO BLACK !!!! THE WHITE TASK BAR IS ABSOLUTELY STUDIO I DONT LIKE IT ONE BIT ..... YOU HAVE MADE LOOKING FOR THINGS VERY DIFFICULT CAN YOU PLEASE CHANGE IT BACK TO BLACK!!!!!!! ASAP ITS VILE IN WHITE .

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Windows 10 white tltle bars

The process suggested sure does change the color of task bar and desktop theme but not the title bars

they still remain white.

 

Search Bar turned white on Windows 10 version 1709

For some reason my search bar went white. I googled this & seems other having issue also & tried this but works & goes back to grey till u type in search bar then goes white again.

1. Settings - Time & language - Region & language. Change your country to Gabon.
2. Sign out.
3. Sign back in. The Cortana search box will be gone as Cortana is not available in Gabon.
4. Go back into Settings and change your country back to the proper one. The Cortana search box will come back, but now it'll be black instead of white.
   
   This does not work on 1709.