html {
  font-size: 10px;
  background: url(https://images8.alphacoders.com/374/374816.jpg) bottom center no-repeat;
  background-size: cover;
  touch-action: manipulation;
}
body,html {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  min-height: 100vh;
}

.top-buffer-200 {
  margin-top: 400px;
}

.keys {
  display: flex;
  flex: 1;
  /*min-height: 100vh;*/
  align-items: center;
  justify-content: center;
}

.key {
  border: .4rem solid black;
  border-radius: 10rem;
  margin: 1rem;
  font-size: 1.5rem;
  padding: 1rem .5rem;
  transition: all .07s ease;
  width: 10rem;
  text-align: center;
  color: white;
  background: rgba(0,0,0,0.4);
  text-shadow: 0 0 .5rem black;
}

.playing {
  transform: scale(1.1);
  border-color: #00ffc2;
  box-shadow: 0 0 1rem #00ffc2;
}

kbd {
  display: block;
  font-size: 4rem;
}

.sound {
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: .1rem;
  color: #00ffc2;
}

.home-button {
  position: absolute;
  left: 20px;
  top: 20px;
}

.social-links li {
  display: inline-block;
  cursor: pointer;
  margin-right: 10px;
  text-decoration: none;
}

.social-links a {
  display: block;
  color: #777777;
  -o-transition:.2s ease-out;
  -ms-transition:.2s ease-out;
  -moz-transition:.2s ease-out;
  -webkit-transition:.2s ease-out;
}

.social-links a:hover {
  color: #33e3f5;
}