Update style.css - added class center

public/style.css

@@ -4,6 +4,11 @@ body {
   max-width: 1280px;
 }
 
+.center {
+  margin-left: auto;
+  margin-right: auto;
+} 
+
 .navbar {
   background-color: #313236;
   border-radius: 2px;