.center-box {
    text-align: center;
}

#actionBtn {
    background: red;
    color: white;
    padding: 12px 28px;
    font-size: 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
}

#actionBtn.active {
    background: yellow;
    color: black;
}

#timerText {
    font-size: 16px;
    margin-top: 8px;
    color: #333;
}