The new <kbd> CSS is not loading for some users. So, for those who just can't wait, use your favorite CSS browser extension/feature to implement it yourself!

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

##Credit: @jin