Create app.py

app.py

@@ -0,0 +1,28 @@
+from dash import Dash, Input, Output, callback, dcc, html
+
+app = Dash(__name__)
+md = """
+# Dash demo
+
+See [The dash examples index](https://dash-example-index.herokuapp.com/) for more examples.
+"""
+
+app.layout = html.Div(
+    children=[
+        dcc.Markdown(children=md, link_target="_blank"),
+        dcc.Dropdown(id="dropdown", options=["red", "green", "blue", "orange"]),
+        dcc.Markdown(id="markdown", children=["## Hello World"]),
+    ]
+)
+
+
+@callback(
+    Output("markdown", "style"),
+    Input("dropdown", "value"),
+)
+def update_markdown_style(color):
+    return {"color": color}
+
+if __name__ == '__main__':
+    app.run_server(host='0.0.0.0', port=8050, debug=False)
+