Update app.py

app.py

@@ -35,15 +35,15 @@ st.markdown("""
             position: fixed;
             left: 0;
             bottom: 0;
-            width: 200px;
+            width: 100%;
             text-align: center;
             padding: 10px;
         }
-        :root[data-theme="light"] .footer {
+        :root[theme="light"] .footer {
             background-color: black;
             color: white;
         }
-        :root[data-theme="dark"] .footer {
+        :root[theme="dark"] .footer {
             background-color: white;
             color: black;
         }