#piano_container button:hover {
  opacity: 0.9;

}

#piano_container {
  height: 33vw;
}

#octave_up, #octave_down {
  background-color: #fff;
  border: none;
  border-radius: 20px;
  width: 40px;
  height: 40px;
  color: var(--orange);
  font-weight: bold;
  font-size: 1.5em;

}

#octave_number {
  text-align: center;
  font-size: 2em;
  font-weight: bold;
  color: #fff;
  margin: 0.4em 0;
}

.piano_key {
  color: var(--orange);
  font-size: 1.5em;
  font-weight: bold;
  touch-action: manipulation;
}


#keyboard_panel {
  position: absolute;
  z-index: 5001;
  height: 40vw;
  bottom:0;
  width: 100%;
  padding: 35px 10%;
  box-sizing: border-box;
  background-color: var(--orange);
  transform: translate(0px, 0px);
transition: all .2s ease-in-out;
}