body {
    background-color: #DFFF22;
    color: #e0e100;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.synth-container {
    background-color: #16213e;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    text-align: center;
}

h1 {
    color: #4ecca3;
    text-align: center;
}

#oscilloscope {
    border: 2px solid #4ecca3;
    margin-bottom: 20px;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.control label {
    margin-right: 10px;
}

.control input[type="range"],
.control input[type="number"],
.control select {
    flex: 1;
}

button {
    background-color: #4ecca3;
    color: #1a1a2e;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background-color: #3da885;
}

.piano-container {
    margin-top: 20px;
}

.octave {
    display: flex;
    justify-content: center;
    align-items: center;
}

.key {
    width: 40px;
    height: 150px;
    border: 1px solid #000;
    margin: 1px;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    cursor: pointer;
    font-size: 12px;
    padding-bottom: 5px;
}

.key.white {
    background-color: #fff;
}

.key.black {
    width: 30px;
    height: 100px;
    background-color: #000;
    color: #fff;
    margin-left: -15px;
    margin-right: -15px;
    z-index: 1;
    position: relative;
}