.tg-temporizador {
    font-family: 'Arial Black', sans-serif;
    font-size: 3em;
    color: #ffffff;
    background: #3f51b5;
    padding: 20px;
    text-align: center;
    border-radius: 12px;
    max-width: 300px;
    margin: 20px auto;
    box-shadow: 0 0 15px rgba(0,0,0,0.2);
}

.tg-tiempo {
    letter-spacing: 2px;
}