.container3 {
    max-width: 800px;
    margin: 20px auto;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    overflow: hidden;
  }

  .header {
    background: linear-gradient(135deg, #ff4d4d, #ff1a1a);
    color: #fff;
    padding: 20px;
    text-align: center;
  }

  .header h1 {
    margin: 0;
    font-size: 26px;
  }

  .content {
    padding: 20px;
  }

  .box {
    background: #f9fafc;
    padding: 15px;
    border-left: 5px solid #ff4d4d;
    margin-bottom: 15px;
    border-radius: 6px;
  }

  .box h3 {
    margin-top: 0;
    color: #ff1a1a;
  }

  ul {
    padding-left: 20px;
  }

  li {
    margin-bottom: 8px;
  }

  .warning {
    background: #fff3cd;
    border-left: 5px solid #ffc107;
  }

  .success {
    background: #e8f5e9;
    border-left: 5px solid #28a745;
  }

  .footer {
    text-align: center;
    padding: 15px;
    background: #f1f1f1;
    font-size: 14px;
  }

  .btn {
    display: inline-block;
    padding: 10px 15px;
    background: #ff1a1a;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    margin-top: 10px;
  }

  .btn:hover {
    background: #cc0000;
  }