html {
  font-size: 10px;
  background: url(/images/england-fans.jpg) bottom center;
  background-size: cover;
}
body,html {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

h1 {
  padding: 20px;
  color: #fff;
  text-shadow: 2px 2px 3px #000;
  text-align: center;
  font-size: 42px;
}

.keys {
  display: flex;
  min-height: 70vh;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.key {
  border: .4rem solid black;
  border-radius: .5rem;
  margin: 1rem;
  font-size: 1.5rem;
  padding: 1rem .5rem;
  transition: all .07s ease;
  width: 10rem;
  text-align: center;
  color: white;
  background: rgba(0,0,0,0.8);
  text-shadow: 0 0 .5rem black;
  cursor: pointer;
}

.playing {
  transform: scale(1.1);
  border-color: #ffc600;
  box-shadow: 0 0 1rem #ffc600;
}

kbd {
  display: block;
  font-size: 4rem;
  pointer-events: none;
}

.sound {
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: .1rem;
  color: #ffc600;
  pointer-events: none;
}

footer {
  text-align: center;
  background: rgba(0,0,0,0.8);
  color: #fff;
  padding: 20px 40px;
}

footer a {
  color: red;
}

@media only screen and (max-width: 600px) {
  h1 {
    padding: 10px;
    font-size: 30px;
  }

  .key {
    margin: .8rem;
    font-size: 1.1rem;
  }

  kbd {
    font-size: 2rem;
  }

  .sound {
    font-size: 1.0rem;
  }
}