This article will tell you everything you need to know about changing the color of your keyboard on an Android phone and an iPhone.
How to change the background color on the iPhone keyboard
Unless you want to install a third-party app like Gboard, the only way to change the keyboard color on an iPhone is to enable dark mode, which turns the keyboard from white to black. Here's how to do that.
Tap Display & Brightness.
Your keyboard is now dark, like many other apps and services on your iPhone.