Aipo.comなどで主に使われている青ボタンです。
見本はこちら
http://jsdo.it/Yukimi.Sato/rBvF
HTML
<a class="btn gradation-blue" href="#">ボタン</a>
CSS
.gradation-blue { color: #FFFFFF; text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.20); background-color: #0095df; background-image: -moz-linear-gradient(top, #0095df, #0064cd); background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#0095df), to(#0064cd)); background-image: -webkit-linear-gradient(top, #0095df, #0064cd); background-image: -o-linear-gradient(top, #0095df, #0064cd); background-image: linear-gradient(to bottom, #0095df, #0064cd); background-repeat: repeat-x; filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff0095df', endColorstr='#ff0067cd', GradientType=0); border-color: #1485da #0f61b8 #0d56ae; *background-color: #0064cd; *border: 1px solid #0f61b8; box-shadow: 0 1px 1px 0 rgba(0, 0, 0, 0.2); }