title: bootstrap icons don't show in production server
body: <p>I made an asp.net MVC web page using twitter bootstrap. In some parts of my web, I use boostrapt icons. In my test server (local IIS) work's fine but in production server, icons draws wrong.</p>
  
  <p><strong>Bad:</strong></p>
  
  <p><img src="https://i.stack.imgur.com/FnDQA.png" alt="enter image description here"></p>
  
  <p><strong>Ok:</strong></p>
  
  <p><img src="https://i.stack.imgur.com/EvxnW.png" alt="enter image description here"></p>
  
  <pre><code>&lt;button class="btn &lt;%if(item.EsFavorita) {%&gt;btn-warning&lt;%} %&gt;" 
  id="&lt;%= item.IdNoticia %&gt;" onclick="InsertarNoticiaFavorita(this);return false;"&gt;
  &lt;i class="&lt;%if(!item.EsFavorita) {%&gt;icon-star-empty&lt;% } 
  else{%&gt;icon-white icon-star&lt;%} %&gt;"&gt;&lt;/i&gt;Favorito &lt;/button&gt; 
  </code></pre>
  
  <p>What could be the cause?</p>
  
  <p>Edit:
  from what I have seen, is a problem with version. "min" of css boostrapt, not load the files of the icons, but it's not that.</p>