title: CSS styling constraints for kindle e-ink reader
body: <p>I am doing some ebook processing. Which involves styling for kindle ebooks. 
  It all looks nice while the newer devices are used, but whenever I open an ebook in older kindle e-ink some styles are not set.
  Sample: </p>
  
  <pre><code>.bordered-box{
      border-style: solid;
      border-width: 2px;
      border-color: #000000;
  }
  </code></pre>
  
  <p>This style is seen fine on kindle-fire and kindle paperwhite, but it is not applied on regular kindle and kindle dx.</p>
  
  <p>Is there any list of constraints and styles that could be applied to those older versions? </p>
  
  <p>PS. Answering a coomment below, here to make it more visible.
  The mobis are generated form epubs, that are generated from HTML. So the process is HTML->epub->mobi</p>