By default, the Huawei smartphone uses a gray background color for the keyboard. You can change the design, which affects the background and keys of the keyboard layout. You'll have a choice of numerous colors and designs, such as color gradients.

Android 10 | EMUI 10.0
Step 1:  Open the  settings
Step 2:  Tap on  System & updates
Step 3:  Tap on  Language & input
Step 4:  Tap on  SwiftKey Keyboard
Step 5:  Tap on  Themes
Step 6:  Choose a  Theme
Step 7:  Tap on  Download
Step 8:  Follow the  instructions  on the display
  1. Open the settings
  2. Tap on System & updates
  3. Tap on Language & input
  4. Tap on SwiftKey Keyboard
  5. Tap on Themes
  6. Choose a Theme
  7. Tap on Download
  8. Follow the instructions on the display

Huawei Instructions