* {
  margin: 0;
  padding: 0;
}

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

.flex > * {
  margin-right: 6px;
  margin-left: 6px;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

body > div > * {
  margin-top: 12px;
}

#song {
  width: 100%;
  padding: 4px;
}

#bpm {
  width: 4rem;
  height: 4rem;
  text-align: center;
  font-size: large;
}

#play-button {
  margin-left: auto;
  padding: 4px;
  width: 100%;
}

.counter {
  width: 100%;
}