Opacity of data-color (stroke)

[lenichols]

How do i change the opacity of the fill color for the lines? I'd like to add this "opacity: 0.6;" to the tag but when i append the stroke color it does nothing. Any help would be greatly appreciated.

$.each(['#f00', '#ff0', '#0f0', '#0ff', '#00f', '#f0f', '#000', '#fff'], function() {
          $('.tools').append("<a href='#the-canvas' data-color='" + this + "' style='border: 1px solid black; width: 30px; font-size:17px; background: " + this + "; display: inline-block;'> &nbsp;&nbsp;</a> ");

[emitategh]

Have you tried with rgba ?