Update app.py

app.py

@@ -27,7 +27,7 @@ with stylable_container(
     css_styles=r"""
         button p:before {
             font-family: 'Font Awesome 5 Free';
-            content: '\f574';
+            content: '\f317';
             display: inline-block;
             padding-right: 3px;
             vertical-align: middle;