I need help to increase font size of table values in mPDF

you increase font size like you do in css

font-size : "Whatever size you want"px

It looks better when view in online but while taking printout the fontsize is not working.
$mpdf=new mPDF('','legal',20,'Times',15,15,16,16);
This code I used to increase total page font size

Hi, Mr.sahilmohile15, I gave like this but the page not showing values.

<style>
#mytable
{
font-size:36px;
}
</style>

Yes, I display data in Table format with in PHP tag.

Can anyone help me to increase font size of a page in mPDF?