body {
  display: flex;
  flex-flow: column nowrap;
  align-items: center;
  gap: 0.5rem;
}

#dm {
  display: flex;
  width: 80vw;
  height: 80vh;
  background: transparent;
  flex-flow: column nowrap;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  border: 1px dotted black;
}

#dm:hover {
  border: 1px dotted gray;
}

#dm > span.toggle-icon {
  padding: 0.6rem;
  cursor: pointer;
  border: 0;
  background: transparent;
  font-size: 2rem;
}

#dm:hover > span.toggle-icon {
  font-size: 4rem;
}

#freq {
  display: flex;
  flex-flow: row nowrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
}

#hz {
  width: 50vw;
  cursor: pointer;
}