Update app.py

app.py

@@ -36,10 +36,10 @@ graph LR;
 
 
 css="""
-svg .flowchart-link{
+svg.style .flowchart-link{
 stroke:red;!important;
 }
-svg .marker {
+svg.style .marker {
     fill: #ed0000!important;
     stroke: #ff0101;!important;
 }