Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more
Unused CSS - Easily find and remove unused CSS rules
PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.
bttn.css - Awesome buttons for awesome projects!
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request