diff --git a/tests/test_ui.py b/tests/test_ui.py
index 2eb2397..ac21368 100644
--- a/tests/test_ui.py
+++ b/tests/test_ui.py
@@ -26,21 +26,42 @@ def test_index_contains_base_page_forms(tmp_path) -> None:
     assert 'id="plan-form"' in html
 
 
-def test_index_contains_import_modal_controls(tmp_path) -> None:
+def test_index_contains_import_window_controls(tmp_path) -> None:
     html = _get_index_html(tmp_path)
 
     assert 'id="open-import-modal-button"' in html
-    assert 'id="import-modal"' in html
-    assert 'id="close-import-modal-button"' in html
-    assert 'id="modal-collection-tree"' in html
-    assert 'id="modal-collection-items"' in html
-    assert 'id="modal-selected-count"' in html
-    assert 'id="modal-select-descendants-button"' in html
-    assert 'id="modal-clear-selection-button"' in html
-    assert 'id="modal-import-selected-items-button"' in html
+    assert 'id="import-window-shell"' in html
+    assert 'id="window-minimize-button"' in html
+    assert 'id="window-maximize-button"' in html
+    assert 'id="window-close-button"' in html
+    assert 'id="window-restore-button"' in html
+    assert 'id="import-window-minimized-bar"' in html
+    assert 'id="window-project-label"' in html
+    assert 'id="window-collection-tree"' in html
+    assert 'id="window-collection-items"' in html
+    assert 'id="window-selected-count"' in html
+    assert 'id="window-clear-selection-button"' in html
+    assert 'id="window-import-selected-items-button"' in html
     assert 'id="item-preview-popover"' in html
-    assert 'isImportModalOpen: false' in html
-    assert "function openImportModal()" in html
-    assert "function closeImportModal()" in html
+    assert 'isImportWindowOpen: false' in html
+    assert "function openImportWindow()" in html
+    assert "function closeImportWindow()" in html
     assert "function updateImportActionState()" in html
     assert 'document.body.classList.toggle("modal-open"' in html
+
+
+def test_index_window_frame_css(tmp_path) -> None:
+    html = _get_index_html(tmp_path)
+
+    assert ".window-frame" in html
+    assert ".window-shell" in html
+    assert ".window-toolbar" in html
+    assert ".window-body" in html
+    assert ".window-minimized-bar" in html
+    assert '"zotero-kb.import-window"' in html
+    assert "startWindowDrag" in html
+    assert "minimizeWindow" in html
+    assert "maximizeWindow" in html
+    assert "restoreWindow" in html
+    assert "initWindowFromSession" in html
+    assert "persistWindowSessionState" in html