html {
  font-size: 10px;
}

body {
    position: relative;
    background-size: 100% 100%;
    background-repeat: no-repeat;
    min-height: 100%;
}

body::after {
  content: "";
  background: url('pics/team-wide.jpg') no-repeat center center;
  background-size:cover;
  opacity: 0.9;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  position: absolute;
  z-index: -1;  
  filter: grayscale(1);
}

body,html {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

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

.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(0,0,0,0.4);
  text-shadow: 0 0 .5rem black;
  user-select: none;
}

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

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

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

@media (max-width: 850px) {
  .keys {
    flex-wrap: wrap;
  }
}