body {
    background: #000;
    color: #ddd;
    font-family: sans-serif;
    margin: 2rem;
}

section {
    margin-bottom: 2rem;
    padding: 1rem 1.5rem;
    border: 1px solid #555;
    border-radius: 6px;
    max-width: 40rem;
}

h2 {
    margin-top: 0;
}

.row {
    margin: 0.5rem 0;
}

.result {
    min-height: 1.2em;
}