HTML2PDF ,Font Size of pdf very small on printing the pdf

var opt = {
margin: 1,
filename: '1099PdfData.pdf',
image: {
type: 'jpeg',
quality: 0.98
},
html2canvas: {
scale: 2
},
jsPDF: {
unit: 'in',
format: a0,
orientation: 'l'
}
};


I am using this parameter to convert HTML to PDF but when printing AO page its very small text how could I increase the text size . Can anyone guide for this

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