body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
}

.container {
    text-align: center;
}

#bpm-display {
    font-size: 10em;
    font-weight: bold;
    color: #333;
}

.buttons button {
    font-size: 2em;
    padding: 20px 40px;
    margin: 10px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    background-color: #4CAF50;
    color: white;
}

#reset-button {
    background-color: #f44336;
}