title: Uncaught ReferenceError: rgba is not defined
body: <p>I am attempting to make a simple animation that would change a color of a font, but I am struggling with said reference error. Can anyone point me to the right direction, please? I have already installed color animation jQuery-plugin. </p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;ul class="menu"&gt; 
  &lt;li&gt;&lt;a href=""&gt;ABOUT US&lt;/a&gt;&lt;/li&gt;        
  &lt;li&gt;&lt;a href=""&gt;CONTACT&lt;/a&gt;&lt;/li&gt;   
  &lt;/ul&gt;
  </code></pre>
  
  <p>JS:</p>
  
  <pre><code>$('.menu').find('a').on('mouseenter', function() {
      $(this).css({color: rgba(239, 231, 35, 0.8)});
  });
  </code></pre>