body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f9f9f9;
  display: flex;
  height: 100vh;
  align-items: center;
  justify-content: center;
}

.error-container {
  text-align: center;
  padding: 30px;
  background: white;
  border-radius: 10px;
  box-shadow: 0px 0px 15px rgba(0,0,0,0.1);
}

.error-container h1 {
  font-size: 80px;
  color: #e74c3c;
  margin: 0;
}

.error-container p {
  font-size: 18px;
  margin: 15px 0;
}

.error-container .btn {
  display: inline-block;
  padding: 10px 20px;
  background-color: #4a76a8;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  font-weight: bold;
}