* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-image: linear-gradient(
      to bottom,
      rgba(245, 246, 252, 0.52),
      rgba(117, 19, 93, 0.73)
    ),
    url("./img/cat-bg.jpg");
  background-attachment: fixed;
  background-size: cover;
  font-family: Poppins, sans-serif;
}

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

.key {
  border: 0.2rem solid white;
  border-radius: 0.5rem;
  width: 6.5rem;
  height: 6.5rem;
  margin: 0.2rem;
  font-size: 1rem;
  padding: 0.5rem 0.5rem;
  transition: all 0.7s ease;
  text-align: center;
  color: white;
  background: rgba(0, 0, 0, 0.4);
  text-shadow: 0 0 0.5rem black;
}

kbd {
  display: block;
  font-size: 2rem;
}

.sound {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1rem;
  line-height: 0.1rem;
  color: #f736c6;
}

.playing {
  transform: scale(1.1);
  border-color: #f736c6;
  box-shadow: 0 0 1rem #f736c6;
}