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

header {
  margin-bottom: 16px;
}

.card {
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
}

button {
  padding: 6px 12px;
  cursor: pointer;
}