<!-- Bootstrap core CSS-->
  <link href="<?php echo base_url(); ?>assets/vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
  <!-- Custom fonts for this template-->
  <link href="<?php echo base_url(); ?>assets/vendor/font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">
  <!-- Page level plugin CSS-->
  <link href="<?php echo base_url(); ?>assets/vendor/datatables/dataTables.bootstrap4.css" rel="stylesheet">
  <!-- Custom styles for this template-->
  <link href="<?php echo base_url(); ?>assets/css/sb-admin.css" rel="stylesheet">