Address bar in mobiel browser - background colour

I want to change the colour of the address bar on a mobile browser.
At present, on mobile and when viewing the website via the chrome browser the address bar background is white.

I tried following the guidance in this article with no success:

https://www.wpbeginner.com/wp-tutorials/how-to-change-the-color-of-address-bar-in-mobile-browser-to-match-your-wordpress-site/

I was wondering if there is any other solution?

It is a small feature but the websites who apply it do look more professional