Buttong png background not going away

i am working on a theme and i am unable to get rid of background of button despite it being a png with transparent background.here is the link, (its pvt) what am i missing?

Try adding this:

button.button {
background-image: url(../images/download-buttons.png);
width: 152px;
height: 34px;
border: 0;
color: #FFF;
margin: 5px auto;
[COLOR="#FF0000"]background-color: transparent;[/COLOR]

it worked! Thanks but i don’t understand the problem.what was missing? png are suppose to be transparent

Yes, it was transparent, meaning that the gray background color on the button was showing through.