make link look like button

Author: igorw

source/index.html

@@ -63,7 +63,9 @@ <h2 class="text-center">Supported frameworks</h2>
     </ul>
     {% endspaceless %}
 
-    <p class="text-center"><a href="http://symfony.com/components/HttpKernel">See the full list on symfony.com</a></p>
+    <p class="text-center">
+        <a href="http://symfony.com/components/HttpKernel" class="btn">See the full list on symfony.com</a>
+    </p>
 </div>
 
 <hr>