title: R markdown: how to change style with internal css?
body: <p>I know how to change R markdown style with a custom css file. However, when the changes are minor, I prefer internal or even inline css, to save trouble from managing two files. I googled and haven't find a solution for this. Below is a simple example of changing style with an external css file. Is there a way to do it with internal or inline css?</p>
  
  <p>The R markdown file:</p>
  
  <pre><code>---
  title: "test"
  output: 
      html_document:
          css: test.css
  ---
  
  ## Header 1 {#header1}
  But how to change style with internal css?
  </code></pre>
  
  <p>The test.css file:</p>
  
  <pre><code>#header1 {
  color: red;
  }
  </code></pre>