styles.css

[v-cloak]{
    display:none;
}

#BF, #BF textarea{
    font-size : 12px;
    font-family: 'Courier New';
}

#BF.container {
    width: 500px;
    margin: 20px auto;
}

#BF.row {
    margin-bottom: 20px;
}

#BF textarea {
    width: 100%;
    padding: 4px;
    box-sizing: border-box;
    height: 50px;
    margin-bottom: 5px;
}

#BF h2 {
    font-size: 14px;
    border-bottom: 1px solid #666;
    color: #666;
    padding: 0 0 4px 0;
    letter-spacing: 0.05em;
}

#BF .source span {
    padding: 0.2px;
    margin-right: 5px;
    color: #bbb;
    display: inline-block;
    cursor: pointer;
    border-bottom: 4px solid transparent;
}

#BF .source span.current {
    font-weight: bold;
    padding: 0.2px;
    color: #666;
    display: inline-block;
    cursor: pointer;
    border-bottom: 4px solid #ccc;
}

#BF>.hidden {
    display : none;
}

#BF textarea:disabled{
    background: #eee;
}