styles.css

body {
  text-align: center;
  background-color: black;
}

#level-title {
  font-family: "Press Start 2P", cursive;
  font-size: 2.5rem;
  margin: 5%;
  color: #fef2bf;
  line-height: 2;
}

.container {
  display: block;
  width: 50%;
  margin: auto;
}

.btn {
  margin: 25px;
  display: inline-block;
  height: 170px;
  width: 170px;
  border: 5px solid grey;
  border-radius: 50%;
  box-shadow: 5px 5px 5px rgba(90, 89, 89, 0.4);
}

p {
  text-align: center;
}

button {
  padding: 15px;
  color: white;
  background-color: grey;
  border-radius: 15%;
  font-size: 2.5rem;
  border: none;
}

.rules {
  border-radius: 10px;
  font-size: 2rem;
  padding: 40px;
  background-color: grey;
  border: 3px solid white;
  margin: 50px 100px 50px 100px;
  
}

.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;
}