body {
      background: #f3f1ee;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      min-height: 100vh;
      margin: 0;
      font-family: 'Comic Sans MS', 'Comic Sans', cursive, sans-serif;
    }
    .container {
      display: flex;
      flex-direction: column;
      align-items: center;
      margin-top: 32px;
    }
    #drawing-canvas {
      border: 2px solid #222;
      border-radius: 10px;
      background: #fff;
      margin-bottom: 16px;
      touch-action: none;
      max-width: 95vw;
      height: auto;
      box-shadow: 0 2px 8px rgba(0,0,0,0.07);
    }
    .controls {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }
    button {
      padding: 8px 20px;
      border: 2px solid #222;
      border-radius: 8px;
      background: #fff;
      font-size: 1em;
      cursor: pointer;
      transition: background 0.15s, color 0.15s;
    }
    button.active, button:hover {
      background: #222;
      color: #fff;
    }
    .back-button {
      position: absolute;
      top: 24px;
      left: 24px;
      padding: 8px 24px;
      border: 2px solid #222;
      border-radius: 8px;
      background: #fff;
      font-size: 1em;
      font-family: inherit;
      color: #222;
      text-decoration: none;
      cursor: pointer;
      transition: background 0.15s, color 0.15s;
      z-index: 10;
    }
    
    .back-button:hover {
      background: #222;
      color: #fff;
    }
    
    @media (max-width: 600px) {
      #drawing-canvas {
        width: 98vw !important;
        max-width: 98vw;
        height: auto !important;
      }
      .back-button {
        top: 8px;
        left: 8px;
        padding: 6px 14px;
        font-size: 0.95em;
      }
    }