Sharing how to change your Gboard Theme to Dark Mode from wikihow.It is a nice combination with the new update of Redmi note 7 ROM  update Dark Mode

1. Settings - additional settings - Languages & input - Gboard - Theme

2 Select a dark theme. You can see different types of dark themes in there. Tap on the Show more option to see more themes. Select the dark theme you'd like.

3. apply

4 done

Thank You