.tuner {
  margin-top: 20px;
}

#note-display {
  font-size: 2rem;
  margin-bottom: 10px;
}

.visualizer {
  width: 100%;
  height: 100px;
  background-color: #0a0a0a;
  border: 1px solid #10b857;
}

button {
  background-color: #10b857;
  color: #0a0a0a;
  padding: 10px 20px;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  margin-top: 20px;
}

button:hover {
  background-color: #0a0a0a;
  color: #10b857;
  border: 1px solid #10b857;
}