body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f7f7f7;
}

.timer-container {
    text-align: center;
}

#timer {
    font-size: 4em;
    margin: 20px;
    background-color: #333;
    color: white;
    padding: 20px;
    border-radius: 10px;
}

.buttons {
    display: flex;
    justify-content: center;
}

button {
    font-size: 1.2em;
    margin: 5px;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

#startButton {
    background-color: #4CAF50;
    color: white;
}