I am using PuppeteerSharp(ver 18.0.5.0) to generate webPage to PDF.
This is my WebPage view ⬇
WebPage view

After using Puppeteer to download, this is what my PDF file shows ⬇
PDF file view

Here is my PdfOptions setting

await page.PdfAsync(pdfPath, new PdfOptions
{
    Format = PaperFormat.A4,
    PrintBackground = true,
    PreferCSSPageSize = true,
});

And below is css setting.

@media print {
    @page {
        margin: 22mm 15mm 35mm 15mm;
        background-color: teal !important;
    }

    html, body, #content, #header, #footer, .page {
        background-color: teal !important;
        -webkit-print-color-adjust: exact !important;
    }
}

I have been setting PrintBackground attr, and setting css, but none of these are working.