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

body {
  height: 100vh;
  background-color: #a9c9ff;
  background-image: linear-gradient(180deg, #a9c9ff 0%, #ffbbec 100%);
  display: grid;
  place-content: center;
}

.keys {
  display: flex;
  justify-content: center;
  align-content: center;
}

.key {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
  width: 10rem;
  text-align: center;
  border: 0.2rem solid #3697ca;
  border-radius: 0.8rem;
  margin: 1rem;
  padding: 1rem;
  transition: all 0.07s ease;
}

kbd {
  display: block;
  font-size: 2rem;
  font-weight: 600;
}

.sound {
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 0.1rem;
  color: #000000;
}

.playing {
  transform: scale(1.1);
  border-color: #7adcff;
  box-shadow: 0 0 1rem #7adcff;
  background: rgba(255, 255, 255, 0.05);
}