body {
    font-family: Arial, sans-serif;
    margin: 30px;
}

.container {
    width: 380px;
}

fieldset {
    border: 1px solid #777;
    padding: 15px;
}

legend {
    font-weight: bold;
}

.row {
    margin-bottom: 12px;
}

.row label {
    display: inline-block;
    width: 80px;
}

.row input[type="date"] {
    padding: 3px;
    width: 150px;
}

button {
    padding: 4px 10px;
    cursor: pointer;
}

.result {
    margin-top: 10px;
    font-weight: bold;
}