diff --git a/chrome/content/zotero-platform/unix/tab.css b/chrome/content/zotero-platform/unix/tab.css
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/chrome/content/zotero-platform/unix/tagselector.css b/chrome/content/zotero-platform/unix/tagselector.css
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/chrome/content/zotero-platform/win/tab.css b/chrome/content/zotero-platform/win/tab.css
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/chrome/content/zotero-platform/win/tagselector.css b/chrome/content/zotero-platform/win/tagselector.css
new file mode 100644
index 0000000000..e69de29bb2