#countdown-timer {
    background-color: #00ff6a;
    padding: 20px 0;
    text-align: center;
}
#countdown-timer h2 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 20px;
}
#countdown {
    font-size: 1.5rem;
    font-weight: bold;
    color: #154D38;
}
#countdown span {
    font-size: 2rem;
    color: #154D38;
    background-color: none;
    margin: 0 10px;
    border: #333 0px solid;
    padding: 5px 10px;
    border-radius: 5px;
}

@media (max-width: 600px) {
    #countdown-timer h2 {
        font-size: 1.5rem;
    }
    #countdown {
        font-size: 1.2rem;
    }
    #countdown span {
        font-size: 1.5rem;
        margin: 0 5px;
        padding: 3px 5px;
    }
}