有趣的CSS样式

kbd {
    padding: .1em .6em;
    border: 1px solid #ccc;
    font-size: 11px;
    font-family: Arial,Helvetica,sans-serif;
    background-color: #f7f7f7;
    color: #333;
    -moz-box-shadow: 0 1px 0 rgba(0,0,0,0.2),0 0 0 2px #fff inset;
    -webkit-box-shadow: 0 1px 0 rgba(0,0,0,0.2),0 0 0 2px #fff inset;
    box-shadow: 0 1px 0 rgba(0,0,0,0.2),0 0 0 2px #fff inset;
    border-radius: 3px;
    display: inline-block;
    margin: 0 .1em;
    text-shadow: 0 1px 0 #fff;
    line-height: 1.4;
    white-space: nowrap
}

sup {
    font-size: 80%;
    position: relative;
    top: -0.4em
}

sub {
    position: relative;
    top: .3em;
    font-size: 80%
}