Fix broken fa icon

index.html

@@ -143,7 +143,7 @@
                 </div>
                 <div class="col-lg-6">
                     <section>
-                        <span class="feature-icon page-scroll"><a class="fa fa-check-square-o" href="#features" title="Features"></a></span>
+                        <span class="feature-icon page-scroll"><a class="fa fa-check-square" href="#features" title="Features"></a></span>
                     </section>
                         <header>
                             <h2>Features</h2>