Lazy load css for legacy themes

Author: KoolADE85

tests/test_row_data_sync.py

@@ -1,3 +1,4 @@
+import time
 import dash_ag_grid as dag
 from dash import Dash, html, dcc, Input, Output, no_update, ctx
 import json
@@ -110,6 +111,7 @@ def virtualDataUpdate(c, d):
 
     grid = utils.Grid(dash_duo, "grid")
 
+    time.sleep(0.5)
     grid.wait_for_cell_text(0, 0, "Toyota")
 
     base = (