title: JQuery keyboard css assigning color to button (key) with certain class fails
body: <p>Stack Overflowers,</p>
  
  <p>I'm having a hard time with CSS, it's about assigning a color to a button with a specific class, pretty straight-forward. There is more code involved, but this is the only thing I'm interested right now, <a href="https://jsfiddle.net/cpkiller/yfxywa8w/6/" rel="nofollow">link to jsfiddle</a>.</p>
  
  <p>I want to assign the color black to the button 'a', this button has a few classes: <code>class="ui-keyboard-button ui-keyboard-a ui-state-default ui-corner-all"</code> according to Firefox' Inspector, so to assign the color black, I've tried a few things:</p>
  
  <p><code>.ui-keyboard-button .ui-keyboard-a .ui-state-default .ui-corner-all {
    color: black;
  }</code></p>
  
  <p><code>.ui-widget-content .ui-state-default .ui-keyboard-a</code></p>
  
  <p><code>ui-keyboard-a</code> and <code>ui-keyboard-button</code></p>
  
  <p>Nothing works and only in the two last versions is it shown in the inspector with a cross through it.</p>
  
  <p>Does any of you know how to assign anything to the button? Thanks in advance!</p>