Chinese characters do not appear in codeigniter dompdf

Question

I made a pdf with dompdf on the codeigniter when xampp was able to appear but when uploaded to the server it didn't appear and the checkbox didn't appear

Why? Can you help me?

CSS :

@font-face {
        font-family: 'Firefly';
        font-style: normal;
        font-weight: normal;
        src: url('<?php echo base_url() ?>/vendor/dompdf/dompdf/lib/fonts/fireflysung.ttf') format('truetype');
      }

      body{
        font-family: 'Firefly';
      }

My html checkbox :

<?php $br=0; foreach ($purchase as $a): $br++;?>
           <?php $wik=$br%2; if ( $wik == 1): ?>
              <tr>
            <?php endif; ?>
                    <td>
                      <label><input type="checkbox" <?php if ($data->id_purchase==$a->id_purchase): ?>
                        checked
                        <?php else: ?>
                          disabled
                      <?php endif; ?>> <?php echo $a->nama ?> </label>
                    </td>
          <?php $wik2=$br%2; if ($wik2 == 0): ?>
             </tr>
          <?php endif; ?>
      <?php endforeach; ?>

pdf in xampp

pdf in server