some indication that you can scroll further (#118)

* scroll_hint function added

* added a visual aid for scroll

src/app.py

@@ -24,6 +24,14 @@
 app = dash.Dash(__name__, external_stylesheets=[dbc.themes.BOOTSTRAP])
 server = app.server
 
+def scroll_hint():
+    return dbc.Card(
+        html.P("Scroll for more", className="text-center"),
+        body=True,
+        className="sticky-bottom mb-2",
+        style={'backgroundColor': '#f8f9fa', 'opacity': '0.7'}
+    )
+
 # Configure cache
 cache = Cache(app.server, config={
     'CACHE_TYPE': 'simple'
@@ -353,6 +361,7 @@ def footer():
                         ],
                         justify="center",
                     ),
+                    scroll_hint(),
                     footer(),
                 ]
             ),