diff --git a/stylesheets/styles.css b/stylesheets/styles.css
index f14d9e46..dd7a636d 100644
--- a/stylesheets/styles.css
+++ b/stylesheets/styles.css
@@ -148,6 +148,12 @@ img {
   margin: 10px 0 32px 0;
   border: 1px solid #ccc;
 }
+img.header
+{
+  margin: 0 auto;
+  max-width: 400px; 
+  border: 0;
+}
 
 
 /* Code blocks */
@@ -410,4 +416,4 @@ footer {
     font-size:12pt;
     color:#444;
   }
-}
\ No newline at end of file
+}