title: iOS icon for Add to Home Screen turns black
body: <p>I'm not terribly familiar with the code to add icons for iOS (and Android) when you select "Add to Home Screen", but I used the following, based on what I read:</p>
  
  <pre><code>    &lt;link rel="apple-touch-icon-precomposed" href="http://www.redtypewriter.com/wp-content/uploads/2014/03/57.jpg"/&gt;  
      &lt;link rel="apple-touch-icon-precomposed" sizes="72x72" href="http://www.redtypewriter.com/wp-content/uploads/2014/03/72.jpg"/&gt;  
      &lt;link rel="apple-touch-icon-precomposed" sizes="114x114" href="http://www.redtypewriter.com/wp-content/uploads/2014/03/114.jpg"/&gt;  
  </code></pre>
  
  <p>The code seems to work, but after I add it to my home screen, after some time, the icon disappears and I'm left with a black square in place of the icon? What's happening? The site is: <a href="http://www.redtypewriter.com/" rel="noreferrer">http://www.redtypewriter.com/</a> if you want to take a look, and I am using a custom WordPress theme.</p>
  
  <p>Thanks!</p>