html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  background-color: #011f3f;
  font-family: "Press Start 2P", cursive;
  color: #fff;
  overflow-x: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

#level-title {
  font-size: 3rem;
  margin: 5%;
  color: #fef2bf;
}

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

.btn {
  margin: 25px;
  display: inline-block;
  height: 200px;
  width: 200px;
  border: 10px solid black;
  border-radius: 20%;
}

.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;
}

footer {
  width: 100%;
  text-align: center;
  padding: 20px;
  background-color: #111;
  font-size: 0.7rem;
}

/* Media queries */
@media (max-width: 1100px) {
  #level-title {
    font-size: 2rem;
  }

  .btn {
    height: 150px;
    width: 150px;
    margin: 15px;
  }
}

@media (max-width: 840px) {
  #level-title {
    font-size: 2rem;
  }

  .btn {
    height: 125px;
    width: 125px;
    margin: 12.5px;
  }
}