body {
      background-color: #222;
      color: white;
    }
    #gameCanvas {
      background-color: blue;
      display: block;
      margin: 20px auto;
      border: 2px solid white;
      cursor: pointer;
    }
    .hidden {
      display: none;
    }
    .center {
      text-align: center;
    }
    /* Per rendere il canvas responsive */
    @media (max-width: 768px) {
      #gameCanvas {
        width: 100%;
        height: auto;
      }
    }