body {
  font-family: monospace;
  background: black;
  color: white;
  text-align: center;
}

#bpmInput {
  width: 60px;
  text-align: center;
}

#beatFlash {
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.1s ease-out;
  margin: 10px auto;
}

#editor {
  height: 400px;
  overflow-y: scroll;
  border: 2px solid white;
  background: #111;
  position: relative;
  margin: 20px auto;
  width: 200px;
}

#timeline {
  height: 2000px;
  position: relative;
}

.note {
  position: absolute;
  width: 30px;
  height: 30px;
  background: white;
  left: 50%;
  transform: translateX(-50%);
  border-radius: 4px;
}