body {
  margin: 0;
  width: 100%;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Helvetica, Arial, sans-serif;
}
select {
  font-size: 16px;
}
.audio {
  display: none;
}
.piano {
  width: 1360px;
  height: 600px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  background: #1a1a1a;
  padding: 5px;
}
.piano__body {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.piano__speakers {
  width: 300px;
  height: 150px;
  border-radius: 15px;
  background: radial-gradient(black 15%, transparent 16%) 0 0,
    radial-gradient(black 15%, transparent 16%) 8px 8px,
    radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 0 1px,
    radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 8px 9px;
  background-color: #282828;
  background-size: 16px 16px;
}
.piano__interface {
  width: 500px;
  height: 200px;
  padding: 15px;
  box-sizing: border-box;
  border-radius: 10px;
  background: #333;
  box-shadow: inset 0 0 10px #111;
  color: #fff;
}
.piano__play-btn {
  font-size: 16px;
}
.piano__keyboard {
  width: 100%;
  height: 300px;
  background: #000;
  display: flex;
}
.piano__key {
  width: 30px;
  height: 100%;
  padding: 0;
  margin: 0 1px;
  background: #fff;
  border: 1px solid #000;
  box-sizing: border-box;
  flex-grow: 1;
  text-align: center;
  border-radius: 0 0 8px 8px;
}
.empty-space {
  position: relative;
}
.piano__key--black {
  background: #000;
  color: #fff;
  height: 60%;
  position: absolute;
  top: 0;
  left: -15px;
}
.piano__key--white {
  padding-top: 180px;
}
.piano__key--playing {
  background: #74b9ff;
}