Struggling to embbed HTML into my project

Create a custom widget, add this code: (with the url is where my html is), but nothing is showing now, so far i only have "Placeholder for HubspotChatWebView. Please try compiling and previewing it again"

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/schema/structs/index.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/widgets/index.dart'; // Imports other custom widgets
import '/custom_code/actions/index.dart'; // Imports custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom widget code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

import 'dart:io';
import 'package:webview_flutter/webview_flutter.dart';

class HubspotChatWebView extends StatefulWidget {
  const HubspotChatWebView({
    Key? key,
    this.width,
    this.height,
  }) : super(key: key);

  final double? width;
  final double? height;

  @override
  State<HubspotChatWebView> createState() => _HubspotChatWebViewState();
}

class _HubspotChatWebViewState extends State<HubspotChatWebView> {
  @override
  void initState() {
    super.initState();
    if (Platform.isAndroid) {
      WebView.platform = SurfaceAndroidWebView();
    }
  }

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: widget.width ?? double.infinity,
      height: widget.height ?? 400, // hauteur par défaut
      child: const WebView(
        initialUrl:
            'https://harmonious-hotteok-cfd826.netlify.app/', // Remplace par ton URL hébergée
        javascriptMode: JavascriptMode.unrestricted,
      ),
    );
  }
}  voici mon code mais je n'ai rien qui s'affiche