Update app.py

app.py

@@ -409,7 +409,8 @@ def mm(graph,zoom):
     #wrap { width: 100%; height: 100%; padding: 0; overflow: auto; };
     #frame { width: 100%; border: 1px solid black; };
     #frame { zoom: $ZOOM; -moz-transform: scale($ZOOM); -moz-transform-origin: 0 0; };
-    """.replace("$ZOOM",str(zoom))
+    """
+    css=css.replace("$ZOOM",str(zoom))
     code_out=f"<style>{css}</style>"
     for ea in graph.split("\n"):
         code=ea.strip().strip("\n")