body {
  text-align: center;
  background-color: #3773b2;
}


#level-title {
  font-family: 'Press Start 2P', cursive;
  font-size: 3rem;
  margin:  5%;
  color: #FEF2BF;
}

.container {
  display: block;
  width: 50%;
  margin: auto;
  margin-bottom: 100px;

}

.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: #e74c3c
}

.green {
  background-color:#2ecc71
}

.blue {
  background-color: #3498db
}

.yellow {
  background-color: #f1c40f;}

.pressed {
  box-shadow: 0 0 20px white;
  background-color: grey;
}
footer {
    text-align: center;
    padding: 10px;
    font-size: 14px;
    color: #ffffff;
  }