body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #282c34;
    color: white;
  }
  
  .simon-game {
    display: grid;
    grid-template-columns: repeat(2, 150px);
    grid-gap: 10px;
    margin-bottom: 20px;
  }
  
  .color-button {
    width: 150px;
    height: 150px;
    border: 2px solid #000;
    border-radius: 10px;
    cursor: pointer;
    opacity: 0.4;
  }
  
  #top-left { background-color: green; }
  #top-right { background-color: rgb(255, 0, 0); }
  #bottom-left { background-color: yellow; }
  #bottom-right { background-color: blue; }
  
  .color-button.active {
    opacity: 1;
  }
  
  #start-button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    background-color: #61dafb;
    border: none;
    border-radius: 5px;
    color: #000;
  }
  
  #start-button:hover {
    background-color: #21a1f1;
  }