* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  background: url(/img/bg.jpg) no-repeat;
  background-size: cover;
  height: 100vh;
  overflow: hidden;
}
body::before {
  content: "";
  display: block;
  background-color: #6d4914;
  height: 100vh;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0.6;
  z-index: -1;
}
.container {
  margin: auto;
  display: flex;
  align-content: center;
  justify-content: space-around;
  text-transform: uppercase;
  padding: 1rem 0;
  margin-top: 40vh;
  color: #ffffff;
}

.key {
  text-align: center;
  border: orange 2px solid;
  padding: 1rem;
  font-weight: bold;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.07s ease-out;
}
span {
  display: block;
  font-weight: normal;
  color: orange;
}

.playing {
  transform: scale(1.2);
  color: orange;
  border-color: #ffffff;
}