Autofocus username field

assets/login.erb

@@ -123,7 +123,7 @@
   <form method="post">
     <div class="form-group">
       <label for="username">Username</label>
-      <input type="text" id="username" name="username" autocomplete="username" required>
+      <input type="text" id="username" name="username" autocomplete="username" required autofocus>
     </div>
     <div class="form-group">
       <label for="password">Password</label>