Have you ever tried to find a lightweight yet nice theme for the R Markdown documents, like this page?
Themes for R Markdown With the powerful rmarkdown package, we could easily create nice HTML document by adding some meta information in the header, for example
--- title: Nineteen Years Later author: Harry Potter date: July 31, 2016 output: rmarkdown::html_document: theme: lumen --- The html_document engine uses the Bootswatch theme library to support different styles of the document.