Update streamlit_app.py

streamlit_app.py

@@ -135,9 +135,16 @@ def _render_hero():
     st.markdown(
         """
         <style>
-            html, body, [data-testid="stAppViewContainer"] {
+            /* Keep layout stable in fullscreen (HF embed sometimes toggles scrollbars) */
+            html, body {
+                width: 100%;
                 overflow-x: hidden;
+                overflow-y: scroll; /* always show vertical scrollbar to avoid horizontal shift */
                 scrollbar-gutter: stable both-edges;
+                overscroll-behavior: contain;
+            }
+            [data-testid="stAppViewContainer"] {
+                overflow: hidden;
             }
             .main {
                 background: radial-gradient(circle at 20% 20%, rgba(101, 80, 255, 0.08), transparent 35%),