iOS code block overflow not scrolling on mobile

Site URL: http://www.harrisoncarto.com

I have code blocks on my website and would like to make overflow text scroll on mobile rather than wrap. I've included the following code, which works for desktop windows but not mobile ones:

pre, ul, ol, dl {
  font-family: courier;
  line-height: 1.3em;
  overflow: auto;
}

I've also included a picture of what the code looks like on mobile. Any help is appreciated.