diff --git a/slides/configuration.md b/slides/configuration.md
index 842420df18b5d93f6ecaecedd133d82fbe84fb7d..48f9eea53d0cd86ab278322061fa5651320a8b7b 100644
--- a/slides/configuration.md
+++ b/slides/configuration.md
@@ -46,7 +46,7 @@ If there are 2 files named `id_rsa`, you have an SSH key.
 <br><br>
 If you don’t have yet an SSH key, you have to generate one:
 ```bash
-$ ssh-keygen -t rsa -b 4096
+$ ssh-keygen -t rsa # -b 4096
 ```
 
 <br>
diff --git a/slides/github_gitlab.md b/slides/github_gitlab.md
index 46d88f8694fc1dccaaaf7687db9b27790d356bea..a9bc1f27e5abefac55edc64dbc47ecca606816b4 100644
--- a/slides/github_gitlab.md
+++ b/slides/github_gitlab.md
@@ -12,7 +12,7 @@ Positive point: GitHub and GitLab are (almost) the same.
 
 ## GitHub
 
-[www.github.com](www.github.com)
+[https://github.com](https://github.com)
 <br><img src="https://assets-cdn.github.com/images/modules/logos_page/GitHub-Mark.png" alt="GitHub" style="width: 200px;"/>
 
 <div class="fragment">
diff --git a/slides/img/icon-live-demo.png b/slides/img/icon-live-demo.png
index 1511dc7e76a9240d19b7e854fe9b6912d098edd8..4b9e6f031078329479b4cc8ea875b9657fda224a 100644
Binary files a/slides/img/icon-live-demo.png and b/slides/img/icon-live-demo.png differ