Google+ style CSS buttons.

gistfile1.css

input.button, a.button, span.button {
    color: #6e6e6e;
    text-decoration: none;
    padding: 2px 12px;
    position: relative;
    display: inline-block;
    text-shadow: 0 1px 0 #fff;
    -webkit-transition: border-color .218s;
    -moz-transition: border .218s;
    -o-transition: border-color .218s;
    transition: border-color .218s;
    background: #f3f3f3;
    background: -webkit-gradient(linear,0% 40%,0% 70%,from(#F5F5F5),to(#F1F1F1));
    background: -moz-linear-gradient(linear,0% 40%,0% 70%,from(#F5F5F5),to(#F1F1F1));
    border: solid 1px #dcdcdc;
    border-radius: 2px;
    margin-right: 10px;
}
input.button:hover, a.button:hover, span.button:hover {
    color: #333;
    border-color: #999;
    -moz-box-shadow: 0 2px 0 rgba(0, 0, 0, 0.2) -webkit-box-shadow:0 2px 5px rgba(0, 0, 0, 0.2);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}
input.button:active, a.button:active, span.button:active {
    color: #000;
    border-color: #444;
}