Restyle / Add Bootstrap/Tailwind/Material to a PHP website

I have an older PHP based website using HTML/CSS. I need to update the look and feel of the site using some CSS framework to allow responsive feel and modern widgets/text styling. It will also need to have openstreet map added to its functionality. There would be potential to add filters/sorting to an in place search result page. I also have some style guides to potentially work from if it helps. It might need some added javascript.