title: LESScss converting rgba to hex? how to nest color variables into a mixin?
body: <p>Does LESScss convert all rgba colors to hex values?</p>
  
  <p>I am trying to create a mixin, say, .color, that allows you to pass in a color variable previously defined, and I want it to be in rgba.</p>
  
  <p>this doesn't work, but here's the idea:</p>
  
  <pre><code>.bgcolor(@colorvariable,@alpha) {
       background-color: @colorvariable + rgba(0, 0, 0, @alpha);
       }
  </code></pre>
  
  <p>Where <code>@colorvariable</code> would be, <code>@blue: rgb(17,55,76);</code> or <code>@green: rgb(125,188,83);</code> etc.</p>
  
  <p>I want to define a bunch of these variables, and then be able to pass them in to <code>.bgcolor</code> or <code>.color</code> mixin and change the alpha transparency on the fly.</p>
  
  <p>I feel like this should be possible, but I am missing something. -Right now, my code only ever outputs a hex color value, almost no matter what I input.- If I pass in an @alpha value of 1, it outputs a hex color value. Only @alpha values less than 1 force the browser to show me an rgba value. So that's solved.</p>
  
  <p>Now--how to pass in the rgb and a parts separately from a predefined variable?</p>