body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  background: white;
  padding: 60px 40px;
  border: 2px solid #e0e0e0;
  max-width: 500px;
  width: 90%;
  text-align: center;
}

.error-code {
  font-size: 72px;
  color: #f44336;
  margin-bottom: 20px;
  font-weight: bold;
}

.message {
  font-size: 20px;
  color: #666;
  margin-bottom: 30px;
  line-height: 1.5;
}

.back-home {
  display: inline-block;
  padding: 15px 30px;
  background: #2196f3;
  color: white;
  text-decoration: none;
  border: 2px solid #2196f3;
  font-size: 18px;
  font-weight: bold;
  transition: all 0.3s;
}

.back-home:hover {
  background: white;
  color: #2196f3;
}

@media (max-width: 600px) {
  .container {
    padding: 40px 20px;
  }

  .error-code {
    font-size: 56px;
  }

  .message {
    font-size: 18px;
  }

  .back-home {
    font-size: 16px;
    padding: 12px 24px;
  }
}