Update app.py

app.py

@@ -35,7 +35,7 @@ def run_script(html: str, style: str,font_col,back_col):
             #html=driver.page_source
             driver.implicitly_wait(30)
             driver.set_window_size(500, 4096)
-            obj = driver.find_element(By.class, "main")            
+            obj = driver.find_element(By.CLASS_NAME, "main")            
             #obj = driver.find_element(By.ID, "app-container")            
             #obj = driver.find_element(By.ID, "conversation-feed")            
             #obj = driver.find_element_by_id("in_html")