Today I come across the website of
PaperHive with my Android
phone and the tab in the chrome browser was blue instead of gray. I wanted the same for my website in green. I
checked the HTML source of the website and found the responsible
theme-color. Here a small example with
<!DOCTYPE html> <html lang="en"> <head> <!-- ... --> <meta name="theme-color" content="#84db94"> <!-- ... --> </head> <body> <!-- ... --> </body> </html>
The result looks like this on my phone.