public function index() {
    $this->load->model('Customer');
    $this->load->library('pagination');
    $config = [
        'base_url' => base_url("/"),
        'per_page' => 10,
        'total_rows' => $this->Customer->get_num_rows(),
        'uri_segment' => 5,
        'first_tag_open' =>  '<li>',
        'first_tag_close' => '</li>',
        'last_tag_open' =>  '<li>',
        'last_tag_close' => '</li>',
        'full_tag_open' =>  '<ul class="pagination">',
        'full_tag_close' => '</ul>',
        'next_tag_open' =>  '<li>',
        'next_tag_close' => '</li>',
        'prev_tag_open' =>  '<li>',
        'prev_tag_close' => '</li>',
        'num_tag_open' =>   '<li>',
        'num_tag_close' =>  '</li>',
        'cur_tag_open' =>   '<li class="active"><a>',
        'cur_tag_close' =>  '</a></li>',
    ];
    $this->pagination->initialize($config);
    $customers = $this->Customer->getCustomers($config['per_page'], $this->uri->segment($config['uri_segment']));
    $this->load->view('home', ['records'=>$customers]);
}

class Customer extends CI_Model {
 public function __construct() {
    $this->load->database();
 }

 public function getCustomers($limit, $offset) {
    $this->db->limit($limit, $offset);
    $query = $this->db->get('customers');
    return $query->result();
 }
}

<div class="pagination-container text-center">
    <?php echo $this->pagination->create_links(); ?>
</div>

http://localhost/cicrud/10