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how to set CSS for MPDF in yii2 on generating pdf file

I am using yii2 basic and I need to generate a pdf report file which is styled with CSS file, I get the pdf well but CSS is not working on the generated file. Here is how I have implemented.

in my controller.php file

 public function actionPrintReport($student_id,$exam_id,$total_subjects,$exam_date){
        $model = new Results();
        $examReportData = $model->getExamReport($student_id,$exam_id,$exam_date);
     
        $htmlContent = $this->renderPartial('_report',
        [
            'model' => $model,
            'total_subjects' => $total_subjects,
            'examReportData' => $examReportData
        ]);
        $pathfile = "Student_exam_report";
        $mpdf = new \Mpdf\Mpdf([
            'tempDir' => Yii::getAlias('@runtime/') . 'mpdf2/tmp',
            'format' => 'A4-L',
            'margin_right' => 5,'margin_left' => 5,
            'defaultFont' => 'Calibri',
        ]);
        $stylesheet = '<head><link rel="stylesheet" type="text/css" href="'.Yii::getAlias('@web').'\css\exam_report.css'.'"/></head>';
        $mpdf->WriteHTML($stylesheet, \Mpdf\HTMLParserMode::HEADER_CSS);
        $mpdf->WriteHTML($htmlContent, \Mpdf\HTMLParserMode::HTML_BODY);
        $mpdf->Output($pathfile, 'I');
    }

The _report.php file is located in view/ with the below minimal code

<?php
    use yii\helpers\Html;
?>

<div class="container" style="width: 100%">
   <div class="leftpan">Left Pan</div>
   <div class="rightpan">Right Pan</div>
</div>

And CSS file is located at project_folder/web/css/exam_report.css with the minimal code like this.

 .rightleft{
    height: 150px;
    float: left;
    border-style: dotted dashed solid double;
}
.rightpan{
    height: 150px;
    float: right;
    border-style: dotted dashed solid double;
}

I have stacked here for two days :), I would appreciate for your support.



source https://stackoverflow.com/questions/70440173/how-to-set-css-for-mpdf-in-yii2-on-generating-pdf-file
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