body {

    font-family: sans-serif;
    margin: 20px;
    font-size: 20px;
}

button {
    font-weight: bold;
    padding: 20px;
    min-width: 200px;
}

#output,
#htmlsource {
    border: 1px solid #333333;
    width: 200px;
    height: 300px;
}

#htmlsource {
    padding: 10px;
}



li {
    line-height: 40px;
}