Firefox buttons have padding, Chrome buttons do not

How do I get my <button>s to look consistent in Firefox and Chrome? Is there a non-conditional CSS solution? Right now, Firefox's buttons have extra padding even though YUI's CSS Reset made the padding 0.

I discovered that to get the same appearance, Chrome needs to have double the padding.

            #fileActions button {
                padding: 0.2em;
            }

@media screen and (-webkit-min-device-pixel-ratio:0) {
            #fileActions button {
                padding: 0.4em;
            }
}

Chrome

Firefox