fixed dhcp template markup

there was one closing div too many leading to empty
content area when nav is collapsed

templates/dhcp.php

@@ -12,6 +12,7 @@
 <div class="row">
   <div class="col-lg-12">
     <div class="card">
+
       <div class="card-header">
         <div class="row">
           <div class="col">
@@ -25,10 +26,12 @@
           </div>
         </div><!-- /.row -->
       </div><!-- /.card-header -->
+
       <div class="card-body">
         <?php $status->showMessages(); ?>
         <form method="POST" action="?page=dhcpd_conf" class="js-dhcp-settings-form">
           <?php echo CSRFTokenFieldTag() ?>
+
           <!-- Nav tabs -->
           <ul class="nav nav-tabs mb-4">
             <li class="nav-item"><a class="nav-link active" href="#server-settings" data-toggle="tab"><?php echo _("Server settings"); ?></a></li>
@@ -38,7 +41,9 @@
             <li class="nav-item"><a class="nav-link" href="#logfile-output" data-toggle="tab"><?php echo _("Logging"); ?></a></li>
           </ul>
           <!-- Tab panes -->
+
           <div class="tab-content">
+
             <div class="tab-pane active" id="server-settings">
               <h4 class="mt-3">DHCP server settings</h4>
               <div class="row">
@@ -177,6 +182,7 @@
                   </div>
                 </div>
               </div><!-- /.row -->
+
             </div><!-- /.tab-pane | advanded tab -->
 
             <div class="tab-pane fade" id="client-list">
@@ -278,14 +284,14 @@
               </div><!-- /.row -->
             </div><!-- /.tab-pane -->
 
-  <?php echo $buttons ?>
-
-  </div>
-
           </div><!-- /.tab-content -->
+
+          <?php echo $buttons ?>
         </form>
       </div><!-- ./ card-body -->
+
       <div class="card-footer"> <?php echo _("Information provided by Dnsmasq"); ?></div>
+
     </div><!-- /.card -->
   </div><!-- /.col-lg-12 -->
 </div><!-- /.row -->