Brtdku

I am using dompdf library for downloading pdf format. the first created a pdf template in HTML format then a function used to call the dompdf library and viewing the function of download pdf .but it doesn't work CSS and HTML tags.below show the function of the controller

$this->load->library('Pdf');

    $id=$this->uri->segment(3);

     $data['title']='Invoice';

    $data['invoice_view']= $this->Invoice_Model->get_purchaseorder_by_id($id);

    $this->load->view('components/pdftemplate',$data);

    $html = $this->output->get_output();



     $dompdf=new DOMPDF();

     $dompdf->load_html($html);

     $dompdf->render();

     $dompdf->stream("invoice.pdf");enter code here

then created html template

<div class="block">

    <div class="row">

        <div class="col-md-6">

            <p>company Logo</p>

        </div>

        <div class="col-md-6"  style="float:left;color:red;">

            <p>Purchase Order</p>

        </div>

    </div>

    <div class="app-heading app-heading-small">                                

        <div class="title">

            <h5><?= $title;?></h5>

        </div>

    </div>

    <?php foreach($invoice_view as $inv):?>

     <div class="row">

            <div class="col-md-6">

               <div class="app-widget-informer">

                    <div class="title">To:<?= $inv->client_company_name;?></div>

                    <div class="tinyintval"><?= $inv->address;?></div>    

                    <div class="tinyintval"></div>                                                                             

                    <div class="tinyintval">Phone:<?= $inv->phone;?></div>

                    <div class="tinyintval">Email:<?= $inv->email;?></div>

               </div>

          </div>

            <div class="col-md-6">

                <div class="app-widget-informer">   

                    <div class="tinyintval">Po#:<?= $inv->invoice_id;?></div>                                        

                    <div class="tinyintval">Po Date:<?= $inv->issue_date;?></div>                                         

                </div>

            </div>                                

    </div>

                    <table class="table table-bordered" >

                        <thead>

                            <th>slno </th>

                            <th> Description</th>

                            <th>Unit Price</th>

                            <th>Quantity</th>

                            <th>Cost</th>

                            <th>Tax %</th>

                        </thead>

                       <tbody>

                       <?php foreach($inv->tableinvoice as $tabin):?>

                                <tr >

                                    <td>

                                    <?= $tabin->id; ?>

                                    </td>       

                                    <td>

                                    <?= $tabin->description; ?>

                                     </td>

                                    <td>

                                    <?= $tabin->quantity; ?>

                                    </td>

                                    <td>

                                    <?= $tabin->unitprice; ?>

                                    </td>

                                    <td>

                                    <?= $tabin->cost; ?>

                                    </td>

                                    <td>

                                    <?= $tabin->tax; ?>

                                    </td>

                               </tr>

                               <?php endforeach;?>      

                        </tbody>

                     </table>

                   <?php endforeach;?>

    </div>

but getting a text format doesn't work css and html styles.