A few updates to styles.

Author: Carreau

_posts/2009-02-02-timeline.md

@@ -1,9 +1,13 @@
 ---
 bg: 'white'
 fa-icon: calendar
+style: center
 ---
 
 #   Projects Timeline
 
 <div id="visualization"></div>
 
+Feel free to [send us a pull requests] that adds your project to this timeline. 
+
+

_posts/2010-01-04-sign.md

@@ -2,6 +2,7 @@
 title: sign
 fa-icon: pencil
 bg: lightgray
+style: center
 ---
 
 # Sign the pledge