title: font-awesome icons not showing in certain element
body: <p>I am trying to create a page using twitter bootstrap.
  My problem is font awesome icons are not working everywhere.As you can see in code i provided,in button amazon and cart icons displaying properly but dollar icon is not being displayed.Similarly Android icon working but battery and camera icons not working.What i am doing wrong here?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;&lt;/title&gt;
    &lt;link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"&gt;
    &lt;link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"&gt;
    &lt;link href="https://fonts.googleapis.com/css?family=Oswald" rel="stylesheet"&gt; 
  &lt;/head&gt;
  &lt;body&gt;
  &lt;div class="container"&gt;
    &lt;div class="row"&gt;
      &lt;div class="col-md-4 "&gt;
        &lt;div class="card mb-4 box-shadow"&gt;
          &lt;img class="card-img-top" data-src="holder.js/100px225?theme=thumb&amp;amp;bg=55595c&amp;amp;fg=eceeef&amp;amp;text=Thumbnail" alt="Thumbnail [100%x225]" style="height: 225px; width: 100%; display: block;" src="data:image/svg+xml;charset=UTF-8,%3Csvg%20width%3D%22348%22%20height%3D%22225%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20348%20225%22%20preserveAspectRatio%3D%22none%22%3E%3Cdefs%3E%3Cstyle%20type%3D%22text%2Fcss%22%3E%23holder_161ad3c12bc%20text%20%7B%20fill%3A%23eceeef%3Bfont-weight%3Abold%3Bfont-family%3AArial%2C%20Helvetica%2C%20Open%20Sans%2C%20sans-serif%2C%20monospace%3Bfont-size%3A17pt%20%7D%20%3C%2Fstyle%3E%3C%2Fdefs%3E%3Cg%20id%3D%22holder_161ad3c12bc%22%3E%3Crect%20width%3D%22348%22%20height%3D%22225%22%20fill%3D%22%2355595c%22%3E%3C%2Frect%3E%3Cg%3E%3Ctext%20x%3D%22116.5%22%20y%3D%22120.3%22%3EThumbnail%3C%2Ftext%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fsvg%3E" data-holder-rendered="true"&gt;
          &lt;div class="card-body"&gt;
            &lt;p class="card-text item-header"&gt;&lt;i class="fa fa-hashtag"&gt;&lt;/i&gt;1  Samsung galaxy note 8&lt;/p&gt;
             &lt;div class="d-flex justify-content-between align-items-center"&gt;
          &lt;div class="btn-group mb-2"&gt;
            &lt;button type="button" class="btn btn-lg btn-outline-secondary amazon"&gt;&lt;i class="fa fa-amazon"&gt;&lt;/i&gt;&lt;a href="" &gt; Amazon&lt;/a&gt;&lt;/button&gt;
            &lt;button type="button" class="btn btn-lg btn-outline-secondary"&gt;&lt;i class="fa fa-dollar-sign"&gt;&lt;/i&gt; 400&lt;/button&gt;
          &lt;/div&gt;  
        &lt;/div&gt;
        &lt;div class="btn-group"&gt;
            &lt;button type="button" class="btn btn-lg btn-outline-secondary ebay"&gt;&lt;i class="fa fa-shopping-cart"&gt;&lt;/i&gt; Ebay&lt;/button&gt;
            &lt;button type="button" class="btn btn-lg btn-outline-secondary"&gt;500&lt;/button&gt;
          &lt;/div&gt;
            &lt;/div&gt;
          &lt;/div&gt;
        &lt;/div&gt;
        &lt;div class="spec"&gt;
          &lt;table class="table table-responsive table-striped"&gt;
            &lt;tbody&gt;
            &lt;tr&gt;
            &lt;th&gt;&lt;i class="fa fa-android"&gt;&lt;/i&gt; OS&lt;/th&gt;
            &lt;td&gt;Android Marshmallow 6.0&lt;/td&gt;
            &lt;/tr&gt;
            &lt;tr&gt;
            &lt;th&gt;STORAGE&lt;/th&gt;
            &lt;td&gt;Internal: 32/64GB&lt;br&gt;
              Expandable: Yes(128GB)&lt;/td&gt;
            &lt;/tr&gt;
            &lt;tr&gt;
            &lt;th&gt;RAM&lt;/th&gt;
            &lt;td&gt;2/3/4GB&lt;/td&gt;
            &lt;/tr&gt;
            &lt;tr&gt;
            &lt;th&gt;&lt;i class="fa fa-battery-bolt"&gt;&lt;/i&gt; Battery &amp; SIM&lt;/th&gt;
            &lt;td&gt;Dual Sim(1 nano and 1 micro)4GLTE&lt;br&gt;
                4100mAh Non-Removable&lt;/td&gt;
            &lt;/tr&gt;
            &lt;tr&gt;
            &lt;th&gt;&lt;i class="fa fa-camera-alt"&gt;&lt;/i&gt; Camera&lt;/th&gt;
            &lt;td&gt;Rear:13MP (CMOS Camera,f2.0 Aperature)&lt;br&gt;
            Front: 5MP (1080p Full HD Video Recording)
            &lt;/td&gt;
            &lt;/tr&gt;
            &lt;tr&gt;
            &lt;th&gt;Processor&lt;/th&gt;
            &lt;td&gt;Qualcomm  Snapdragon 625 Octa-core&lt;br&gt;
            Adreno 506&lt;/td&gt;
            &lt;/tr&gt;
            &lt;tr&gt;
            &lt;th&gt;Dispaly&lt;/th&gt;
            &lt;td&gt;1920 x 1080 5.5 inch (401ppi)IPS LCD&lt;/td&gt;
            &lt;/tr&gt;
            &lt;/tbody&gt;
            &lt;/table&gt;
            &lt;/div&gt;  
          &lt;/div&gt;
    &lt;/div&gt;
     
  &lt;/div&gt; 
  &lt;script type="text/javascript" src="http://code.jquery.com/jquery-3.3.1.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"&gt;&lt;/script&gt; 
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>