#header {
  display: flex;
  gap: 10px;
}

#filters {
  border: 1px solid lightgray;
  padding: 10px;

  & h2 {
    margin: 8px 0 4px;
    font-size: 1.2em;
  }
  & > section > header {
    display: block;
    & > h2 {
      display: inline-block;
    }
  }
  & > details > summary {
    margin-top: 8px;
    margin-bottom: 4px;
  }
}