title: Trying to remove the gridlines and background in a PCA using ggbiplot in R
body: <p>I have made a PCA in R using</p>
  <pre><code>ggbiplot(PCA.model,ellipse=TRUE,labels=PCA_data
       $label,groups=PCA_data$Month)
  </code></pre>
  <p>[image of PCA][1]</p>
  <p>but i need to remove the grey and the gridlines. I have tried solutions on here but nothing has worked so far.</p>
  <p>I have tried this and various other themes but no luck.</p>
  <pre><code>ggbiplot(PCA.model,ellipse=TRUE,labels=PCA_data
      $label,groups=PCA_data$Month, frame.colour = NULL) 
        $label,groups=PCA_data$Month) + theme_classic()
  </code></pre>
  <p>Any ideas? :)
  [1]: <a href="https://i.stack.imgur.com/ADIn9.png" rel="nofollow noreferrer">https://i.stack.imgur.com/ADIn9.png</a></p>