diff --git a/lib/less/colors.js b/lib/less/colors.js
index e509b602..ed4c2838 100644
--- a/lib/less/colors.js
+++ b/lib/less/colors.js
@@ -140,6 +140,7 @@
         'teal':'#008080',
         'thistle':'#d8bfd8',
         'tomato':'#ff6347',
+        'transparent':'rgba(0,0,0,0)',
         'turquoise':'#40e0d0',
         'violet':'#ee82ee',
         'wheat':'#f5deb3',