* {
  --color-primary: #5eaf30;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  margin: 0;
}

#form-power {
  display: flex;
  flex-direction: column;
}

input, button, select, textarea {
  font: inherit;
}

input[type="number"] {
  text-align: end;
  border: none;
  inline-size: 4em;
  vertical-align: baseline;
  border-block-end: solid 2px transparent;
}

input[type="number"]:focus {
  outline: none;
  border-block-end-color: var(--color-primary);
}

button {
  user-select: none;
}

#synthesizer {
  margin-inline: auto;
  margin-block: 1rem;
  padding: 1rem;
  max-inline-size: 40rem;
}

#piano-keyboard {
  position: -webkit-sticky;
  position: sticky;
  inset-block-end: 0;
  box-shadow: 0 0 2em #000;
}