body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    margin: 0;
    padding: 20px;
}

.timer-display {
    font-size: 48px;
    text-align: center;
    font-family: monospace;
}

.buttons {
    grid-template-columns: repeat(4, 1fr);
}

.button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 15px;
    font-size: 16px;
    cursor: pointer;
    margin: 5px;
    border-radius: 5px;
}