How to add HTML and CSS to PDF in PHP: a complete guide to generating PDF from HTML

Hello everyone! I'm new to PHP and trying to create a PDF file with nice formatting for outputting invoices on my site. I need tables, colors, fonts, and images in the PDF — basically, full HTML with CSS.\n\nI tried using FPDF, but everything is drawn through methods like `Cell()`, `Rect()`, and `MultiCell()`, which is extremely inconvenient for complex layouts. For example, to make a table with a gradient and rounded corners, you have to write a ton of code. And if you need to add CSS styles like in regular HTML, it's completely unclear.\n\nHere's my current FPDF code that only outputs "Hello World":\n\n```php\nAddPage();\n$pdf->SetFont('Arial', 'B', 16);\n$pdf->Cell(40, 10, 'Hello World!');\n$pdf->Output();\n?>\n```\n\nI want to do something