body {
  font-family: Arial, sans-serif;
  background-color: #f2f2f2;
  margin: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.controls, .midi-controls {
  margin-bottom: 20px;
  font-size: 16px;
}

/* MIDI controls styling */
.midi-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.midi-controls input,
.midi-controls button {
  margin: 5px;
}
#midi-progress {
  width: 300px;
  height: 10px;
  background: #ddd;
  margin-top: 10px;
  border-radius: 5px;
  overflow: hidden;
}
#midi-progress-bar {
  height: 100%;
  width: 0;
  background: #76c7c0;
}

#piano-container {
  position: relative;
  user-select: none;
}

/* White keys styling */
.white-key {
  width: 40px;
  height: 180px;
  background: white;
  border: 1px solid #ccc;
  display: inline-block;
  position: relative;
  z-index: 1;
  box-sizing: border-box;
  margin: 0;
}

.white-key.active {
  background: #e6e6e6;
}

/* Black keys styling */
.black-key {
  width: 24px;
  height: 100px;
  background: black;
  position: absolute;
  z-index: 2;
  margin: 0;
  border-radius: 3px;
  box-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

.black-key.active {
  background: #444;
}