diff --git a/lib/codelabs/src/exceptions.dart b/lib/codelabs/src/exceptions.dart
index 8bde94741..a8fe57f47 100644
--- a/lib/codelabs/src/exceptions.dart
+++ b/lib/codelabs/src/exceptions.dart
@@ -10,4 +10,4 @@ class CodelabFetchException implements Exception {
   final String message;
 
   const CodelabFetchException(this.failureType, [this.message]);
-}
\ No newline at end of file
+}
diff --git a/lib/codelabs/src/fetcher.dart b/lib/codelabs/src/fetcher.dart
index 318775d7d..9644b04dd 100644
--- a/lib/codelabs/src/fetcher.dart
+++ b/lib/codelabs/src/fetcher.dart
@@ -11,6 +11,7 @@ abstract class CodelabFetcher {
     @required String repo,
     String ref,
     String path,
-  }) => GithubCodelabFetcher(owner: owner, repo: repo, path: path, ref: ref);
+  }) =>
+      GithubCodelabFetcher(owner: owner, repo: repo, path: path, ref: ref);
   factory CodelabFetcher.webserver(Uri uri) => WebServerCodelabFetcher(uri);
 }
diff --git a/lib/playground.dart b/lib/playground.dart
index 0a7e5ff7b..6976f988b 100644
--- a/lib/playground.dart
+++ b/lib/playground.dart
@@ -50,7 +50,6 @@ import 'util/detect_flutter.dart';
 import 'util/keymap.dart';
 import 'util/query_params.dart' show queryParams;
 
-
 Playground get playground => _playground;
 
 Playground _playground;
diff --git a/lib/util/github.dart b/lib/util/github.dart
index 95ffe2a04..5bff0a3df 100644
--- a/lib/util/github.dart
+++ b/lib/util/github.dart
@@ -8,6 +8,6 @@ String extractGitHubResponseBody(String githubResponse) {
   // characters ('\n') included.
   final contentJson = json.decode(githubResponse);
   final encodedContentStr =
-  contentJson['content'].toString().replaceAll('\n', '');
+      contentJson['content'].toString().replaceAll('\n', '');
   return utf8.decode(base64.decode(encodedContentStr));
-}
\ No newline at end of file
+}
diff --git a/web/example/codelabs/dart/step_01/solution.dart b/web/example/codelabs/dart/step_01/solution.dart
index 8942817ca..521ae8519 100644
--- a/web/example/codelabs/dart/step_01/solution.dart
+++ b/web/example/codelabs/dart/step_01/solution.dart
@@ -1,3 +1,3 @@
 void main() {
   print('Solution');
-}
\ No newline at end of file
+}