Convert deprecated center tags to CSS; General tidy

notifications.php

@@ -1,6 +1,4 @@
-<?php include("inc_all.php"); ?>
-
-<?php 
+<?php require_once("inc_all.php");
 
 $sql = mysqli_query($mysqli, "SELECT * FROM notifications LEFT JOIN clients ON notification_client_id = client_id WHERE notification_dismissed_at IS NULL AND (notification_user_id = $session_user_id OR notification_user_id = 0) AND notifications.company_id = $session_company_id ORDER BY notification_id DESC");
 
@@ -63,16 +61,12 @@ $sql = mysqli_query($mysqli,"SELECT * FROM notifications LEFT JOIN clients ON no
             </div>
         </div>
 
-  <?php 
-  }else{
-  ?>
-    <center class="my-5">
+        <?php } else { ?>
+            <div class="my-5" style="text-align: center">
                 <i class='far fa-fw fa-6x fa-bell-slash text-secondary'></i><h3 class='text-secondary mt-3'>No Notifications</h3>
-    </center>
+            </div>
+        <?php } ?>
 
-  <?php
-  }
-  ?>
     </div>
 
-<?php include("footer.php");
+<?php require_once("footer.php");