.key {
    font-weight: bold;
    text-transform: uppercase;
    border-radius: 4px;
    background: #f9f9f9;
    border: 1px solid #aaa;
    padding: 0 6px;
    margin: 0 3px 0 7px;
    color: #aaa;
    font-size: 14px;
}

.key.spacebar {
    text-transform: none;
    font-weight: normal;
}

.text-muted .key {
    border: 1px solid #bbb;
    background: #f9f9f9;
    color: #bbb;
}

.panel-heading.lead {
    margin-bottom: 0;
}