body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.container {
    text-align: center;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 300px;
}
h1 {
    font-size: 2rem;
    color: #333;
}
input {
    padding: 8px;
    width: 80%;
    margin: 10px;
    border-radius: 4px;
    border: 1px solid #ccc;
}
button {
    padding: 10px 20px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}
button:hover {
    background-color: #218838;
}
.result {
    margin-top: 20px;
    font-size: 1.5rem;
    color: #444;
    font-weight: bold;
}