diff --git a/src/teilchensammler_cli/__init__.py b/src/teilchensammler_cli/__init__.py
new file mode 100644
index 0000000..18235ac
--- /dev/null
+++ b/src/teilchensammler_cli/__init__.py
@@ -0,0 +1,8 @@
+"""
+This file exists so the directory becomes a package.
+"""
+
+from .main import main
+
+if __name__ == "__main__":
+    main()
diff --git a/src/teilchensammler_cli/main.py b/src/teilchensammler_cli/main.py
new file mode 100644
index 0000000..3ca3a9b
--- /dev/null
+++ b/src/teilchensammler_cli/main.py
@@ -0,0 +1,63 @@
+"""
+This is where the application is implemented.
+"""
+
+from typing import final, override
+
+from textual.app import App, ComposeResult
+from textual.containers import Horizontal
+from textual.screen import Screen
+from textual.widget import Widget
+from textual.widgets import (
+    Button,
+    Footer,
+    Header,
+    Input,
+)
+
+
+@final
+class SearchBar(Widget):
+    DEFAULT_CSS = """
+    #teilchen-input {
+        width: 4fr;
+    }
+    #button-search, #button-add {
+        width: 1fr;
+    }
+    """
+
+    @override
+    def compose(self) -> ComposeResult:
+        with Horizontal(id="search-bar-widget"):
+            yield Input(
+                placeholder="Enter Teilchen information: name, description, #tags",
+                tooltip=(
+                    "This is a free-form field: Enter a name and "
+                    "description any way you like. You should use #hashtags for any "
+                    "meta information."
+                ),
+                id="teilchen-input",
+                type="text",
+            )
+            yield Button("Add", variant="success", id="button-add")
+            yield Button("Search", variant="default", id="button-search")
+
+
+class AddInventoryScreen(Screen[None]):
+    @override
+    def compose(self) -> ComposeResult:
+        yield Header()
+        yield SearchBar()
+        yield Footer()
+
+
+@final
+class SammlerApp(App[None]):
+    def on_mount(self) -> None:
+        _ = self.push_screen(AddInventoryScreen())
+
+
+def main() -> None:
+    app = SammlerApp()
+    app.run()