my-dark-mode-widget.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
    exit; 
}

class My_Dark_Mode_Lite_Widget extends WP_Widget {
    public function __construct() {
        parent::__construct(
            'my_dark_mode_widget',
            __('Dark Mode Toggle Button', 'my-dark-mode'),
            array('description' => __('A widget to display the dark mode toggle button', 'my-dark-mode'))
        );
    }

    public function widget($args, $instance) {
        echo wp_kses_post($args['before_widget']);
        echo do_shortcode('[my_dark_mode_toggle_button]');
        echo wp_kses_post($args['after_widget']);
    }
    
}

function my_dark_mode_lite_register_widget() {
    register_widget('My_Dark_Mode_Lite_Widget');
}
add_action('widgets_init', 'my_dark_mode_lite_register_widget');