body {
    background-color: #1a1a1a;
    color: #ffffff;
    font-family: Arial, sans-serif;
}

.container {
    max-width: 400px;
    margin: auto;
    padding: 20px;
    border-radius: 5px;
    background-color: #333333;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 10px;
}

input, select {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 5px;
}

button {
    padding: 10px 20px;
    background-color: #007bff;
    color: #ffffff;
    border: none;
    border-radius: 5px;
}

#result {
    margin-top: 20px;
}