::before,
::after,
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  object-fit: cover;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  color: white;
}

body::before {
  content: "";
  background-image: url("../images/concert.jpg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.75;
  z-index: -1;
}

.keys-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  column-gap: 15px;
}

.key {
  background-color: rgba(0, 0, 0, 0.5);
  width: 100px;
  height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border: 5px solid black;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.05s ease-in-out;
}

/* .key:hover {
  box-shadow: 0px 0px 5px 5px yellow;
  scale: 1.1;
} */

.playing {
  box-shadow: 0px 0px 5px 5px yellow;
  scale: 1.1;
}

.key-letter {
  font-size: 3rem;
}

.key-instrument {
  color: yellow;
}