title: Change jupyter notebook theme to highlight R functions
body: <p>I'm using the R programming language with jupyter notebook, but functions are not highlighted like for Python. Is there a way to modify the default theme?</p>
  <p>Just to be clear, below I posted 2 images to show the difference between jupyter notebook and RStudio:</p>
  <p><a href="https://i.stack.imgur.com/1hSZQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1hSZQ.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/Twxjd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Twxjd.png" alt="enter image description here" /></a></p>
  <p>as you can see, functions like length, sort etc. are painted with their own color.</p>