RGBa dropdown with transparency show up as black

[nemus]

in a html FORM, the SELECT dropdown have the followin css attch to : \[code\]input[type="text"], textarea, select, option { border:none; padding:5px; font-size:14px; color: #000; background: rgba(0, 0, 0, 0.1);}\[/code\]the rgba is black 10% transparencyIn most of the "real" browser it work perfectly fine, but not in chrome PC and IE9Simple question, what rule to add/modify to fix that ?Here is a Fiddle.