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

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

.controls {
    margin: 20px 0;
}

.controls button {
    padding: 10px 20px;
    margin: 5px;
    font-size: 16px;
}

.frequency-control,
.volume-control {
    margin: 20px 0;
}

.waveform-control {
    margin: 20px 0;
}

.waveform-control label {
    margin: 0 10px;
    font-size: 16px;
}