Formatting

README.md

@@ -21,6 +21,14 @@
 
 
 ### 2. Generate your SSH key
+
+#### Background information
+
++ What is SSH?
+* What is a SSH key pair?
+
+#### Key generation
+
 + Windows
   + PuTTyGEN [follow tutorial](https://hpc.uni.lu/users/docs/access.html#ssh-key-generation-on-windows)
 + Mac / Linux
@@ -69,11 +77,11 @@ This task has been done already by your awesome R3 team.
 
   Enter the details into PuTTy
 
-  <img src="images/screen1.png" width=300>
+  <img src="images/screen1.png" width=400>
 
   Don't forget to add your SSH key
 
-  <img src="images/screen2.png" width=300>
+  <img src="images/screen2.png" width=400>
 
 * Linux
   * Open your terminal