title: configuring ioslides background with css
body: <p>How can I remove the grey gradient at the bottom of slides generated with ioslides using Rstudio markdown? I managed to remove it from the title slide using custom css:</p>
  
  <pre><code>.title-slide {
   background-color: white; 
  }
  </code></pre>
  
  <p>I have not succeeded in removing it from all other slides, however. The <a href="http://rmarkdown.rstudio.com/ioslides_presentation_format.html#custom_css" rel="noreferrer">ioslides markdown documentation</a> provides very little documentation of the default css used and how to modify it. I have looked at <a href="https://github.com/rstudio/rmarkdown/blob/master/inst/rmd/ioslides/ioslides-13.5.1/theme/css/default.css" rel="noreferrer">default.css</a> on Github. Is there any other documentation that one can use in customising the appearance of ioslides using css?</p>