body {
  background-image: url("https://images.unsplash.com/photo-1533174072545-7a4b6ad7a6c3?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1470&q=80");
  background-size: cover;
  padding: 0px;
}

.center {
  min-height: 100vh;
  align-items: center;
  justify-content: center;
}

.key {
  border: 4px solid gold;
  border-radius: 5px;
  margin: 1rem;
  font-size: 1.5rem;
  padding: 1rem 0.5rem;
  transition: all 0.09s;
  width: 100px;
  text-align: center;
  color: beige;

}

kbd {
  display: block;
  font-size: 50px;
  align-items: center;
  justify-content: center;
}

.playing {
  transform: scale(2);
  border-color: #ffc600;
  box-shadow: 0 0 10px #ffc600;
}

.sound {
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #ffc600;
}