php - Internal style not working for my pdf -

$pdf = new pdf([             // set use core fonts            'mode' => pdf::mode_core,            // a4 paper format            'format' => pdf::format_a4,            // portrait orientation            'orientation' => pdf::orient_portrait,            // stream browser inline            'destination' => pdf::dest_browser,            // html content input            'content' => $content,            // format content own css file if needed or use            // enhanced bootstrap css built krajee mpdf formatting            'cssfile' => '@vendor/kartik-v/yii2-mpdf/assets/kv-mpdf-bootstrap.min.css',            // css embedded if required            'cssinline' => '.kv-heading-1{font-size:18mm}',            // set mpdf properties on fly            'options' => ['title' => 'title'],            // call mpdf methods on fly            'methods' => [               // 'setheader'=>['krajee report header'],               // 'setfooter'=>['{pageno}'],            ],            'margintop' => 1,            'marginbottom' => 1,            'marginleft' => 2,            'marginright' => 0,          ]); 

html:

$html = '<style>'. $mystyle .' </style>';  $html .= '<div>' . $mydiv . '</div>';          echo $html; 

trying print div internal style internal style don't seem work though div showing. there not error shown there chance doesn't support internal style? or did miss out something?

**inline style working

the answer found internal style not working because whatever pass pdf read 'content'. need pass style 'cssinline' , not 'content'.