diff --git a/hamstertools/app.py b/hamstertools/app.py
index 4ea2baa..aef1a61 100644
--- a/hamstertools/app.py
+++ b/hamstertools/app.py
@@ -8,37 +8,11 @@ from textual.reactive import reactive
 
 from .db import DatabaseManager, Category, Activity
 
-class ActivitiesScreen(Screen):
-    BINDINGS = [
-        ("q", "quit", "Quit"),
-        ("s", "sort", "Sort"),
-        ("f", "move_facts", "Move facts"),
-        ("r", "refresh", "Refresh"),
-        ("d", "delete", "Delete activity"),
-        ("/", "filter", "Search"),
-        Binding(key="escape", action="cancelfilter", show=False),
-    ]
-
+class ListScreen(Screen):
     def __init__(self, db_manager):
         self.db_manager = db_manager
         super().__init__()
 
-    def _refresh(self, filter_query=None):
-        self.table.clear()
-
-        # List activities with the count of facts
-        activities = Activity.list_activities(self.db_manager, filter_query)
-
-        self.table.add_rows([[
-            activity.category_id,
-            activity.category_name,
-            activity.id,
-            activity.name,
-            activity.facts_count,
-        ] for activity in activities])
-
-        self.table.sort(*self.sort)
-
     def compose(self) -> ComposeResult:
         """create child widgets for the app."""
         yield Header()
@@ -48,13 +22,6 @@ class ActivitiesScreen(Screen):
                 yield Input(id="filter")
         yield Footer()
 
-    def on_mount(self) -> None:
-        self.table = self.query_one(DataTable)
-        self.table.cursor_type = "row"
-        self.columns = self.table.add_columns("category id","category","activity id","activity","entries")
-        self.sort = (self.columns[1], self.columns[3])
-        self._refresh()
-
     def action_refresh(self) -> None:
         self._refresh()
 
@@ -75,7 +42,6 @@ class ActivitiesScreen(Screen):
     def on_input_submitted(self, event):
         self.table.focus()
 
-
     def action_cancelfilter(self) -> None:
         filter_input = self.query_one("#filter")
         filter_input.display = False
@@ -83,6 +49,45 @@ class ActivitiesScreen(Screen):
         self.table.focus()
         self._refresh()
 
+    def on_input_changed(self, event):
+        self._refresh(event.value)
+
+
+class ActivitiesScreen(ListScreen):
+    BINDINGS = [
+        ("q", "quit", "Quit"),
+        ("s", "sort", "Sort"),
+        ("r", "refresh", "Refresh"),
+        ("/", "filter", "Search"),
+        ("d", "delete", "Delete activity"),
+        ("f", "move_facts", "Move facts"),
+        Binding(key="escape", action="cancelfilter", show=False),
+    ]
+
+
+    def _refresh(self, filter_query=None):
+        self.table.clear()
+
+        # List activities with the count of facts
+        activities = Activity.list_activities(self.db_manager, filter_query)
+
+        self.table.add_rows([[
+            activity.category_id,
+            activity.category_name,
+            activity.id,
+            activity.name,
+            activity.facts_count,
+        ] for activity in activities])
+
+        self.table.sort(*self.sort)
+
+    def on_mount(self) -> None:
+        self.table = self.query_one(DataTable)
+        self.table.cursor_type = "row"
+        self.columns = self.table.add_columns("category id","category","activity id","activity","entries")
+        self.sort = (self.columns[1], self.columns[3])
+        self._refresh()
+
     def action_delete(self) -> None:
         # get the keys for the row and column under the cursor.
         row_key, _ = self.table.coordinate_to_cell_key(self.table.cursor_coordinate)
@@ -118,25 +123,16 @@ class ActivitiesScreen(Screen):
             self._refresh()
             del self.move_from_activity
 
-    def on_input_changed(self, event):
-        self._refresh(event.value)
-
-class CategoriesScreen(Screen):
+class CategoriesScreen(ListScreen):
     BINDINGS = [
+        ("q", "quit", "Quit"),
         ("s", "sort", "Sort"),
         ("r", "refresh", "Refresh"),
-        ("d", "delete", "Delete category"),
         ("/", "filter", "Search"),
+        ("d", "delete", "Delete category"),
         Binding(key="escape", action="cancelfilter", show=False),
     ]
 
-    filtering = reactive(False)
-    filter_query = reactive("")
-
-    def __init__(self, db_manager):
-        self.db_manager = db_manager
-        super().__init__()
-
     def _refresh(self, filter_query=None):
         self.table.clear()
 
@@ -151,15 +147,6 @@ class CategoriesScreen(Screen):
 
         self.table.sort(self.sort)
 
-    def compose(self) -> ComposeResult:
-        """create child widgets for the app."""
-        yield Header()
-        with Vertical():
-            yield DataTable()
-            with Horizontal():
-                yield Input(id="filter")
-        yield Footer()
-
     def on_mount(self) -> None:
         self.table = self.query_one(DataTable)
         self.table.cursor_type = "row"
@@ -167,31 +154,6 @@ class CategoriesScreen(Screen):
         self.sort = self.columns[1]
         self._refresh()
 
-    def action_refresh(self) -> None:
-        self._refresh()
-
-    def action_sort(self) -> None:
-        self.table.cursor_type = "column"
-
-    def action_filter(self) -> None:
-        filter_input = self.query_one("#filter")
-        filter_input.display = True
-        self._refresh(filter_input.value)
-        filter_input.focus()
-
-    def on_input_submitted(self, event):
-        self.table.focus()
-
-    def action_cancelfilter(self) -> None:
-        filter_input = self.query_one("#filter")
-        filter_input.display = False
-        filter_input.clear()
-        self.table.focus()
-        self._refresh()
-
-    def on_input_changed(self, event):
-        self._refresh(event.value)
-
     def action_delete(self) -> None:
         # get the keys for the row and column under the cursor.
         row_key, _ = self.table.coordinate_to_cell_key(self.table.cursor_coordinate)
@@ -205,12 +167,6 @@ class CategoriesScreen(Screen):
         # supply the row key to `remove_row` to delete the row.
         self.table.remove_row(row_key)
 
-    def on_data_table_column_selected(self, event):
-        """ Handle column selection for sort """
-        self.sort = event.column_key
-        event.data_table.sort(self.sort)
-        event.data_table.cursor_type = "row"
-
 # class KimaiScreen(Screen):
 #     def compose(self) -> ComposeResult:
 #         yield Placeholder("Help Screen")
diff --git a/hamstertools/app.tcss b/hamstertools/app.tcss
index 2eb8ed2..0f6cab6 100644
--- a/hamstertools/app.tcss
+++ b/hamstertools/app.tcss
@@ -1,7 +1,3 @@
-Screen {
-	layout: vertical;
-}
-
 DataTable {
 	height: 90%;
 }