body {
        font-family: "Times New Roman", Times, serif;
        background-color: #c0c0c0;
        background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAYAAACp8Z5+AAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAAdgAAAHYBTnsmCAAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAAAWSURBVAiZY2RgYPgPBAxMDEwMDAwMDACNBgEAhAuOXgAAAABJRU5ErkJggg==');
        margin: 0;
        padding: 10px;
        color: #000000;
      }
      
      .main-container {
        background-color: #ffffff;
        border: 2px inset #c0c0c0;
        margin: 0 auto;
        max-width: 600px;
        padding: 0;
        margin-top: 50px;
      }
      
      .header {
        background: linear-gradient(to bottom, #ff0000, #800000);
        color: #ffffff;
        padding: 10px;
        text-align: center;
        border-bottom: 2px outset #c0c0c0;
      }
      
      .content {
        padding: 20px;
        background-color: #ffffff;
        text-align: center;
      }
      
      .error-message {
        border: 3px ridge #c0c0c0;
        padding: 20px;
        margin: 15px 0;
        background-color: #ffcccc;
      }