Include forced center of home page opening content

Author: jordanmccullough

index.html

@@ -18,7 +18,7 @@ <h1>Open source training</h1>
 </section>
 
 <section class="materials">
-  <div class="container">
+  <div class="container center">
     <h2>Materials</h2>
 
       <p>