I'm using rmarkdown to produce a pdf document with conversion done either in RStudio or by using the `render()` function in R. Can anyone give me some pointers for changing the size, colour etc. of the font used for the document title and author names? I have made a lot of progress with things like changing the overall font and so on by editing the front matter in the document but I am completely lost on this one. Please bear in mind that I do not speak LaTeX very well...

Thanks for any help