styles.css

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  scroll-behavior: smooth;
  width: 100%;
  height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
}

main {
  width: 100%;
  height: 100%;
  position: relative;
  background-image: url(pexels-moose-photos-1037992.jpg);
  background-size: cover;
  display: grid;
  place-items: center;
}

main::after {
  content: " ";
  height: 100%;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.842);
  top: 0px;
  left: 0px;
  z-index: 0;
  position: absolute;
}

section.keys {
  display: grid;
  grid-template-columns: repeat(auto-fit, 7ch);
  z-index: 2;
  place-content: center;
  width: 100%;
  gap: 0.8rem;
}

.key {
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  text-transform: uppercase;
  border: 3px solid rgb(19, 17, 17);
  cursor: pointer;
  border-radius: 5px;
  padding: 5px;
  transition: all 0.1s;

  & kbd {
    font-size: 1.5rem;
    color: white;
    font-family: "Times New Roman", Times, serif;
  }

  & span {
    font-size: 8px;
    font-weight: bold;
    color: #d7a900;
  }
}

.playing {
  transform: scale(1.1);
  border-color: #ffc600;
  box-shadow: 0 3px 5px #ffc600;
}