Export from R Shiny to PDF

I have a shiny app that renders data in a dashboard in <div class="main"> in the browser. I want you to build a R Shiny function that exports whatever is under <div class="main"> into a PDF with the exact same format as shown in the browser. It should also make sure that content in <div class="main"> is not "broken" or cut-off when the PDF goes from one side to the next, but that it is nicely presented in full.