span.c {
    font-weight: bold;
    color: rgb(153, 29, 31);
}

.transpose-keys {
    margin: 10px 0;
    overflow: auto;
    font: normal 11px sans-serif;
}
.transpose-keys a {
    display: block;
    float: left;
    width: 2.25em;
    text-align: center;
    margin: 0 0.25em 0.25em 0;
    color: #333;
    background: #eee;
    text-decoration: none;
    padding: 0.4em 0;
    border: solid 1px transparent;
    outline: none;
}
.transpose-keys a.selected {
    background: rgb(153, 29, 31);
    color: #fff;
}