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Description of the bug

SetMargins does not support margin-bottom as the constructor config does, plus margin-left and margin-right are not taken into consideration.

This how I fixed the output in my project row-bloom/row-bloom@683fcd4

mPDF version

v8.1.6

PHP Version and environment (server type, cli provider etc., enclosing libraries and their respective versions)

PHP 8.1.6 (Simply running a script with php ./script.php)

Reproducible PHP CSS HTML snippet suffering by the error

// script.php

use Mpdf\HTMLParserMode;
use Mpdf\Mpdf;

$mpdf = new Mpdf();

$mpdf->SetMargins(50,50,50);

$mpdf->SetHeader('foo');
$mpdf->SetFooter('foo');
$mpdf->WriteHTML('<p>foo</p>');
$mpdf->WriteHTML('', HTMLParserMode::HEADER_CSS);

$mpdf->OutputFile(__DIR__.'./bar.pdf');