body {
  font-family: Arial, sans-serif;
  max-width: 700px;
  margin: 20px auto;
  padding: 0 15px;
  background: #f9f9f9;
}

h1 {
  text-align: center;
  color: #2a2a72;
}

button {
  display: block;
  margin: 15px auto;
  padding: 10px 20px;
  font-size: 1rem;
  cursor: pointer;
  background: #2a2a72;
  color: white;
  border: none;
  border-radius: 5px;
}

button:hover {
  background: #4949a5;
}

.user-list {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
}

.user-card {
  background: white;
  padding: 15px;
  border-radius: 8px;
  width: 250px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.15);
  line-height: 1.5;
}

.user-card strong {
  color: #2a2a72;
}

.error {
  color: red;
  text-align: center;
  margin-top: 10px;
}