reduce size of pagination section at the bottom of the blog index

blog/index.html

@@ -22,7 +22,7 @@ title: All Blog Posts
 
 
 {% if paginator.total_pages > 1 %}
-<div class="text-center"><h3>
+<div class="text-center"><h4>
   {% if paginator.previous_page %}
     <a href="{{ paginator.previous_page_path | prepend: site.baseurl | replace: '//', '/' }}">&laquo; Prev</a>
   {% else %}
@@ -44,5 +44,5 @@ title: All Blog Posts
   {% else %}
     <span>Next &raquo;</span>
   {% endif %}
-</h3></div>
+</h4></div>
 {% endif %}