如何在.Rmd html输出中强制跨平台使用相同的代码块字体？

<style>
    pre code {
        font-family: "Courier New", monospace;
    }
</style>

knitr::opts_chunk$set(
  comment = "#>",
  fig.path = "figure/",
  fig.align = "center",
  fig.show = "hold",
  dev = "png",
  dpi = 300,
  cache = TRUE,
  cache.path = "cache/",
  cache.lazy = TRUE,
  cache.comments = TRUE,
  tidy = TRUE,
  tidy.opts = list(width.cutoff = 60),
  highlight = TRUE,
  highlight.style = "tango",
  highlight.size = "auto",
  highlight.opts = list(markup = TRUE, class.offset = 0, lines = NULL),
  message = FALSE,
  warning = FALSE,
  error = TRUE,
  tidy = FALSE
)

---
title: "My Document"
output:
  html_document:
    pandoc_args: [
      "--css=styles.css"
    ]
---

<style>
    @font-face {
        font-family: "MyFont";
        src: url("fonts/MyFont.ttf");
    }
    pre code {
        font-family: "MyFont", monospace;
    }
</style>