Update project_request_form.md

doc.zih.tu-dresden.de/docs/application/project_request_form.md

@@ -83,20 +83,22 @@ The 'open application' button leads you to either 'new application', 'not yet su
 1- Select a Project type  
 
   
- ![Project type jards][1]
+![Project type jards][1]
+{: align="center"}
   
 <br>
 
 2- Select the NHR center  
   
- ![NHR center][2]
-  
+![NHR center][2]
+{: align="center"}
+
 <br>
 
 3- Enter your email adress and accept the data privacy policy  
   
- ![email adress][3]
-  
+![email adress][3]
+{: align="center"}
 
 ## Access overview of approved projects
 
@@ -108,8 +110,8 @@ Please note that 'not yet approved' applications are not visible via this login.
 
 1- Click the 'Open Project Page' button  
   
- ![open project page][4]
-  
+![open project page][4]
+{: align="center"}
 
 [1]: misc/nhr_jards_login1.jpg "Select project type"
 [2]: misc/nhr_jards_login2.jpg "Select center"