#countdown {
    font-family: 'Arial', sans-serif;
    color: #333;
    background-color: #f2f2f2;
    padding: 20px;
    margin: 20px;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    text-align: center;
    font-size: 1.5em;
}