body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background: #4CAF50;
  color: white;
  padding: 1rem;
  text-align: center;
}

#filters {
  padding: 1rem;
  background: #f4f4f4;
}

#articles {
  padding: 1rem;
}

article {
  border: 1px solid #ddd;
  margin: 1rem 0;
  padding: 1rem;
  border-radius: 5px;
}