body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f4f4f4;
    color: #333;
}

.timer-container {
    background-color: #fff;
    padding: 40px 60px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    color: #007bff;
    margin-bottom: 30px;
}

.timer-display {
    font-size: 5em;
    font-weight: bold;
    margin-bottom: 40px;
    color: #333;
    letter-spacing: 2px;
}

.controls button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 15px 30px;
    margin: 0 10px;
    border-radius: 5px;
    font-size: 1.2em;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.controls button:hover:not(:disabled) {
    background-color: #0056b3;
}

.controls button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}