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

.container {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 80%;
    max-width: 1200px;
    padding: 20px;
    text-align: center;
}

h1, h2 {
    color: #333;
    margin-bottom: 20px;
}

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

.key {
    width: 50px;
    height: 200px;
    background-color: #fff;
    border: 1px solid #000;
    margin: 0 2px;
    cursor: pointer;
    transition: background-color 0.1s ease;
}

.key:hover {
    background-color: #ddd;
}

.key.black {
    width: 30px;
    height: 120px;
    background-color: #000;
    margin: 0 -15px;
    z-index: 1;
}

button {
    padding: 10px 20px;
    background-color: #007BFF;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin: 5px;
}

button:hover {
    background-color: #0056b3;
}

.recorder button, .file-audio button {
    background-color: #dc3545;
}

.recorder button:hover, .file-audio button:hover {
    background-color: #c82333;
}