build a custom wordpress slider using a custom post type

/******** slider in dashboard ********/
/****** paste into functions.php ******/


function my_custom_sliders_posttype(){



   $args = array(

   'labels'=> array( 'name'=>'sliders',

       'singular_name'=> 'slider',

       'menu_name'=>'sliders',

       'name_admin_bar'=> 'sliders',

       'all_items' =>'View all sliders',

       'add_new'=> 'Add New sliders' ),

   'description' =>"This post type is for sliders",

   'public' => true,

   'exclude_from_search'=>false,

   'publicly_queryable'=> true,

   'show_ui' => true,

   'show_in_menu'=> true,

   'show_in_admin_bar'=> true,

   'menu_position'=>6,

   'capability_type'=> 'page',

   'supports'=> array( 'title', 'editor', 'author', 'thumbnail', 'excerpt',

    ),

   'query_var'=>true,
  );



  register_post_type( "sliders", $args );

 }



 add_action("init","my_custom_sliders_posttype");
/******./slider in dashboard***********/








<!--past into custome file-->

<div class="carousel-inner">
               <?php
 $class_active="active";

 $args=array(
      'post_type'=> 'sliders',
      'post_status' => 'publish',
      'posts_per_page' => 3,
 
     );
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {
  while ($my_query->have_posts()) : $my_query->the_post(); ?>
             
                <div class="item <?php echo $class_active ;?>">
                 <?php the_post_thumbnail('full'); ?>

<div class="container">
                 <div class="caro-caps">
                  <h2> <?php the_title(); ?> </h2>
                  <p> <?php the_content();?> </p>
<div class="lnk-btn more-btn"><a href="#">More Details</a></div>
              </div>
            </div>
           
                  </div>
                   <?php

 $class_active="";
  endwhile;
}
wp_reset_query();  // Restore global post data stomped by the_post().
?>
                 
 
</div>