body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f5f5f5;
}

.container {
    text-align: center;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 400px;
    max-width: 90%;
}

h1 {
    color: #333;
    margin-bottom: 1.5rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

input {
    padding: 0.5rem;
    margin: 0 0.5rem;
    width: 60px;
}

button {
    padding: 0.5rem 1rem;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.result {
    margin: 1.5rem 0;
    min-height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
}