Fix readme tests

@@ -79,18 +79,21 @@ Create a Uint8List from the image
 final img = await rootBundle.load('assets/images/logo.jpg');
 final imageBytes = img.buffer.asUint8List();
 ```
+
 Create an image from the ImageBytes
 
 ```dart
-pw.Image image = pw.Image(pw.MemoryImage(imageBytes));
+pw.Image image1 = pw.Image(pw.MemoryImage(imageBytes));
 ```
+
 implement the image in a container
+
 ```dart
 pw.Container(
    alignment: pw.Alignment.center,
    height: 200,
-   child: image,
-),
+   child: image1,
+);
 ```
 
 To load an image from the network using the `printing` package:
@@ -191,7 +194,7 @@ To save the pdf file (Web):
 var savedFile = await pdf.save();
 List<int> fileInts = List.from(savedFile);
 html.AnchorElement(
-    href: "data:application/octet-stream;charset=utf-16le;base64,${con.base64.encode(fileInts)}")
+    href: "data:application/octet-stream;charset=utf-16le;base64,${base64.encode(fileInts)}")
   ..setAttribute("download", "${DateTime.now().millisecondsSinceEpoch}.pdf")
   ..click();
 ```

@@ -48,11 +48,15 @@ void buildFile(String src, String dest, bool flutter) {
 
   final output = File(dest);
   final st = output.openWrite();
+  st.writeln('// ignore_for_file: avoid_web_libraries_in_flutter');
   st.writeln('import \'dart:io\';');
   st.writeln('import \'dart:typed_data\';');
-  if (flutter) {
   st.writeln('import \'package:flutter/services.dart\' show rootBundle;');
+  if (flutter) {
     st.writeln('import \'package:path_provider/path_provider.dart\';');
+  } else {
+    st.writeln('import \'dart:convert\';');
+    st.writeln('import \'dart:html\' as html;');
   }
   st.writeln('import \'package:printing/printing.dart\';');
   st.writeln('import \'package:pdf/pdf.dart\';');