body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 20px;
}

.card {
  margin: 10px;
  padding: 15px;
  border: 1px solid #ccc;
  display: inline-block;
  width: 200px;
  border-radius: 10px;
  box-shadow: 0 0 5px rgba(0,0,0,0.2);
}

#loader.hidden, #error.hidden {
  display: none;
}

@media (max-width: 600px) {
  .card {
    width: 90%;
  }
}