body {
  font-family: Arial, sans-serif;
  background: #f5f6fa;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
}

.container {
  background: #fff;
  padding: 20px 25px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  max-width: 700px;
  width: 100%;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

button {
  display: block;
  margin: 0 auto 20px;
  padding: 10px 20px;
  font-size: 15px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

.user-card {
  border: 1px solid #ddd;
  padding: 15px;
  margin-bottom: 12px;
  border-radius: 8px;
  background: #fafafa;
}

.user-card h3 {
  margin: 0 0 8px;
  color: #333;
}

.user-card p {
  margin: 4px 0;
  color: #555;
}

.error {
  color: red;
  text-align: center;
  margin-top: 15px;
  font-weight: bold;
}