These buttons created entirely from CSS (no images used at all).

They have been tested using Safari 5, Firefox 5, Chrome 12 and Opera 11.5 on the Mac. Sorry if you're using any form of Internet Explorer, but as it doesn't have support for some of the CSS3 properties involved I haven't bothered even trying to see how they render.

The  first creation is a transparent button using subtle gradients and box shadows. Basically it's a pure CSS3 emulation of some buttons that appear on the Apple site. The original buttons use .png graphics to create the effect.

a.transparent:link, a.transparent:visited {
        color: #fff;
        padding: 20px 40px;
        border-style: none;
        background-color: rgba(0,0,0,0);
        font: 14px/1 "Lucida Grande", Lucida, Verdana, sans-serif;
        text-shadow: #000 0 2px 2px;
        -moz-border-radius: 6px;
        -webkit-border-radius: 6px;
        border-radius: 6px;
        display: inline-block;
}

a.transparent:hover {
        -moz-box-shadow: rgba(255,255,255,.28) 0px 1px 1px, inset rgba(0,0,0,.5) 0 1px 4px;
        -webkit-box-shadow: rgba(255,255,255,.28) 0px 1px 1px, inset rgba(0,0,0,.5) 0 1px 4px;
        box-shadow: rgba(255,255,255,.28) 0px 1px 1px, inset rgba(0,0,0,.5) 0 1px 4px;
        background-image: -moz-linear-gradient(top, rgba(0,0,0,.1) 0%, rgba(0,0,0,0) 30%, rgba(0,0,0,.2) 100%);
        background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0.1)), color-stop(30%,rgba(0,0,0,0)), color-stop(100%,rgba(0,0,0,.2)));
        background-image: -webkit-linear-gradient(top, rgba(0,0,0,.1) 0%, rgba(0,0,0,0) 30%, rgba(0,0,0,.2) 100%);
        background-image: -o-linear-gradient(top, rgba(0,0,0,.1) 0%, rgba(0,0,0,0) 30%, rgba(0,0,0,.2) 100%);
        background-image: linear-gradient(top, rgba(0,0,0,.1) 0%, rgba(0,0,0,0) 30%, rgba(0,0,0,.2) 100%);
        -moz-background-clip: padding-box;
        -webkit-background-clip: padding-box;
        background-clip: padding-box;
}

a.transparent:active {
        background: rgba(0,0,0,.3);
        -moz-box-shadow: rgba(255,255,255,.28) 0px 1px 1px, inset rgba(0,0,0,.5) 0 1px 6px;
        -webkit-box-shadow: rgba(255,255,255,.28) 0px 1px 1px, inset rgba(0,0,0,.5) 0 1px 6px;
        box-shadow: rgba(255,255,255,.28) 0px 1px 1px, inset rgba(0,0,0,.5) 0 1px 6px;
}

Read more:http://www.midwinter-dg.com/permalink-cross-browser-pure-css3-button-demo-2011-07-21.html