body {
  text-align: center;
  background-color: #011F3F;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

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

.container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
  max-width: 600px;
  margin: auto;
}

.btn {
  margin: 10px;
  display: inline-block;
  height: 150px;
  width: 150px;
  border: 7px 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;
}

#start-button, #restart-button {
  padding: 15px 30px;
  font-size: 18px;
  margin: 20px auto;
  display: block;
  cursor: pointer;
  background-color: #4CAF50; /* Vibrant green color */
  color: white;
  border: none;
  border-radius: 50px; /* Rounded corners for a pill-like shape */
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2); /* Stronger shadow for depth */
  transition: all 0.3s ease; /* Smooth transition for all properties */
  font-family: 'Press Start 2P', cursive; /* Matching font with the title */
  text-transform: uppercase; /* Uppercase text for emphasis */
  letter-spacing: 2px; /* Spacing between letters */
}

#start-button:hover, #restart-button:hover {
  background-color: #45a049; /* Slightly darker green on hover */
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.3); /* Larger shadow on hover */
  transform: translateY(-2px); /* Slight lift effect on hover */
}

#start-button:active, #restart-button:active {
  transform: translateY(1px); /* Pressed down effect when clicked */
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2); /* Reduced shadow when pressed */
}

footer {
  margin-top: auto;
  padding: 10px;
  color: #FEF2BF;
  font-size: 0.8rem;
}

/* Media Queries for Responsiveness */
@media (max-width: 768px) {
  #level-title {
    font-size: 1.5rem;
  }

  .btn {
    height: 120px;
    width: 120px;
    margin: 8px;
  }

  #start-button, #restart-button {
    padding: 12px 24px;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  #level-title {
    font-size: 1.2rem;
  }

  .btn {
    height: 100px;
    width: 100px;
    margin: 5px;
  }

  #start-button, #restart-button {
    padding: 10px 20px;
    font-size: 14px;
  }
}