title: wrong number of arguments (4 for 3) for `rgb' issue in css.scss file in rails 3.2.13
body: <p><strong>rgb wrong number of arguments issue in rails:</strong></p>
  
  <p>I saw that rgb in css file takes 3 arguments as mentioned here</p>
  
  <p><a href="http://www.w3schools.com/cssref/css_colors.asp" rel="noreferrer">http://www.w3schools.com/cssref/css_colors.asp</a></p>
  
  <p>But in my project abc.css.scss file have code like this</p>
  
  <pre><code>border: 1px solid rgb(100, 100, 100, 2);
  border: 1px solid rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: 0px 3px 2px rgba(67, 67, 67, 0.1);
  -moz-box-shadow: 0px 3px 2px rgba(67, 67, 67, 0.1);
  </code></pre>
  
  <p>So what is happening here. Am I missing something?</p>
  
  <p>Thanks in Advance!</p>