how to customise shiny page with html - anjana3/R-Programming- GitHub Wiki
(Simple understanding of the tags explanation)
(basics to start with css and html in insert into the r programming)
https://www.r-bloggers.com/custom-javascript-css-and-html-in-shiny/
(changing the shiny application page into customise html tags)
https://www.sitepoint.com/shiny-r-and-html-merging-data-science-and-web-development/
(complete information how to embed the iframe r code into website and blogs)