Image thumbnail should be centered.

Author: rajathkmp

_includes/portfolio_grid.html

@@ -16,7 +16,7 @@ <h3 class="section-subheading text-muted">Lorem ipsum dolor sit amet consectetur
                                 <i class="fa fa-plus fa-3x"></i>
                             </div>
                         </div>
-                        <img src="img/portfolio/{{ post.thumbnail }}" class="img-responsive" alt="">
+                        <img src="img/portfolio/{{ post.thumbnail }}" class="img-responsive img-centered" alt="">
                     </a>
                     <div class="portfolio-caption">
                         <h4>{{ post.title }}</h4>
@@ -26,4 +26,4 @@ <h4>{{ post.title }}</h4>
             {% endfor %}
             </div>
         </div>
-    </section>
+    </section>