zotero-better-notes/addon/chrome/content/styles/linkCreator/noteOutline.css

bn-note-outline {
  flex-direction: column;

  #bn-select-note-outline-container {
    flex: 1;
    flex-direction: column;
  }

  #bn-select-note-outline-content {
    min-height: 100%;
  }

  #bn-link-insert-position-container {
    align-items: center;
  }
}