Dark Mode Styling Widget Tutorial

Essential Classy Tab from Dashboad -> Widgets then enable Dark Mode Styling Widget
Now Drag and Drop Dark Mode Styling widget

Text form Normal & Dark Mode, You can use smiley emoji

Body Background

Global Color same as Elementor Global Color Sequence

Style Tab

Button

Manage padding of button.

For normal and Active/Dark mode you can manage Color, Background, Border and Box Shadow.