body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #222;
    color: #eee; 
}

.container {
    text-align: center;
    padding: 40px;
    border: 2px solid #555;
    border-radius: 10px;
    background-color: #333;
    width: 400px;
}

h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

p {
    font-size: 1.2em;
    margin-bottom: 15px;
}

input[type="number"] {
    padding: 15px;
    margin: 15px;
    width: 250px;
    font-size: 1.1em;
    background-color: #444;
    color: #eee;
    border: 1px solid #555;
    border-radius: 5px;
}

button {
    padding: 15px 30px;
    font-size: 1.1em;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0056b3;
}

#message {
    font-weight: bold;
    margin-top: 20px;
    font-size: 1.2em;
}