.user-center {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  font-family: Arial, sans-serif;
}

.profile-header {
  text-align: center;
  margin-bottom: 20px;
}

.avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
}

h1 {
  font-size: 2em;
  margin-top: 10px;
}

.profile-details {
  font-size: 1.2em;
}

.profile-details p {
  margin: 10px 0;
}

.profile-details strong {
  color: #333;
}

.error {
  color: red;
  text-align: center;
}