title: ggplot2 remove outer border around plot
body: <p>Hi I am trying to get rid of the box that ggplot puts around my plot. </p>
  
  <p>Here is some code</p>
  
  <pre><code>d = data.frame(x=rep(1:5,2), y=gl(2,5), height=abs(rnorm(10)))
  
  ggplot(d, aes(x, y, height = height, group = y)) + 
     geom_ridgeline(fill="black", colour="white") +
     theme(panel.grid = element_blank(), panel.background = element_rect(fill = "#000000"), plot.background = element_rect(fill = "#000000"))
  </code></pre>
  
  <p>Produces this image:</p>
  
  <p><a href="https://i.stack.imgur.com/fjm0X.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fjm0X.png" alt="enter image description here"></a></p>
  
  <p>I would like to get rid of the small gray line that borders around my plot. </p>