body {
    font-family: 'Arial', sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    background-color: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #333;
    margin-bottom: 2rem;
}

.numbers-container {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.number {
    width: 50px;
    height: 50px;
    background-color: #4CAF50;
    color: white;
    font-size: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    margin: 0 0.5rem;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

#generate-btn {
    background-color: #007bff;
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

#generate-btn:hover {
    background-color: #0056b3;
}