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

html {
  font-family: 'Press Start 2P', cursive;
  font-size: 62.5%;
  text-align: center;
  background-color: #011f3f;
  color: #fef2bf;
  margin: 4.8rem;
  overflow: hidden;
}

.level-title {
  font-size: 3.6rem;
  line-height: 1.5;
  margin-bottom: 4.8rem;
}

.game-container {
  display: grid;
  grid-template-columns: repeat(2, 24rem);
  align-content: center;
  align-items: center;
  justify-content: center;
  justify-items: center;
  row-gap: 4.8rem;
  column-gap: 4.8rem;
}

.btn {
  display: inline-block;
  width: 100%;
  aspect-ratio: 1;
  border: 10px solid black;
  border-radius: 20%;
  cursor: pointer;
}

.start-btn {
  font-family: 'Press Start 2P', cursive;
  border-radius: 1rem;
  padding: 2.4rem 8rem;
  margin-top: 4.8rem;
  font-size: 3.6rem;
  color: #011f3f;
  font-weight: 800;
  background-color: #fef2bf;
  cursor: pointer;
}

.game-over {
  background-color: red;
  opacity: 0.8;
}

.red {
  background-color: red;
}

.green {
  background-color: green;
}

.blue {
  background-color: blue;
}

.yellow {
  background-color: yellow;
}

.pressed {
  box-shadow: 0 0 20px white;
  background-color: grey;
}

.hidden {
  display: none;
}

footer {
  margin-top: 9.6rem;
  font-size: 1.6rem;
}

@media (max-width: 720px) {
  .game-container {
    row-gap: 3.6rem;
    column-gap: 3.6rem;
  }
}

@media (max-width: 600px) {
  .game-container {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 2.4rem;
    column-gap: 2.4rem;
  }

  .level-title,
  .start-btn {
    font-size: 2.4rem;
  }

  .start-btn {
    display: block;
    width: 100%;
  }

  .btn {
    border: 6px solid black;
  }

  footer {
    font-size: 1.2rem;
  }
}

@media (max-width: 440px) {
  html {
    margin: 3.6rem;
  }

  .level-title,
  .start-btn {
    font-size: 2rem;
  }

  .game-container {
    row-gap: 1.2rem;
    column-gap: 1.2rem;
  }
}