body {
    background-color: #f8f9fa;
    font-family: 'Arial', sans-serif;
}

.container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

h1 {
    color: #343a40;
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 2px solid #007bff;
    padding-bottom: 15px;
}

.card {
    border: none;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
}

.card-header {
    font-weight: bold;
}

.btn-primary {
    background-color: #007bff;
    border: none;
    padding: 10px 20px;
    font-weight: bold;
}

.btn-primary:hover {
    background-color: #0069d9;
}

#result-value {
    color: #28a745;
}

.form-text {
    color: #6c757d;
}