title: Can't set footer to bottom
body: <p>I have this code:</p>
  
  <pre><code>&lt;div id="login-frame" class="frame-container"&gt;
  &lt;h2&gt;Dash&lt;/h2&gt;
  &lt;p&gt;Wellcome&lt;/p&gt;
   &lt;hr&gt;
  &lt;div class="alert hidden"&gt;&lt;/div&gt;
  &lt;div class="frame-content"&gt;
  
  &lt;div class="row"&gt;
    &lt;div id="appuntamenti_futuri" class="command-buttons tile col-xs-6 btn"&gt;
    &lt;b class="title"&gt;Appuntamenti futuri&lt;/b&gt;
    &lt;/div&gt;
    &lt;div id="storico_appuntamenti" class="command-buttons tile col-xs-6 btn"&gt;
     &lt;b class="title"&gt;Storico&lt;/b&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  
  &lt;div class="row"&gt;
    &lt;div id="prenotazioni" class="command-buttons tile col-xs-12 btn"&gt;
    &lt;b class="title"&gt;Prenota&lt;/b&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  
  &lt;div class="row"&gt;
    &lt;div id="card" class="command-buttons tile col-xs-6 btn"&gt;
    &lt;b class="title"&gt;Card&lt;/b&gt;
    &lt;/div&gt;
    &lt;div id="prepagate" class="command-buttons tile col-xs-6 btn"&gt;
      &lt;b class="title"&gt;Abbonamento prepagate&lt;/b&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p></p>
  
  <pre><code>&lt;div id="frame-footer"&gt;
    &lt;span style="color: #FFFFFF"&gt;Developed by&lt;/span&gt;
    &lt;a href="#" target="_blank"&gt;
                  Someone
    &lt;/a&gt; 
   &lt;span id="select-language" class="label label-warning"&gt;
                      Language
   &lt;/span&gt;
   &lt;/div&gt;
  
  &lt;/div&gt;
  </code></pre>
  
  <p>and this is a <a href="https://jsfiddle.net/DTcHh/16139/" rel="nofollow">jsfiddle</a></p>
  
  <p>how you can see the footer isn't on the bottom but there is a blank line after it, I set the background of the body for show you the problem. What I did wrong?</p>