Update app.py

app.py

@@ -54,7 +54,7 @@ def run_script(url: str, height: int, width: int, check_b,check_h):
             #print (driver.html)
             driver.implicitly_wait(30)
             driver.set_window_size(int(width), int(height))
-            page = driver.find_element(By.TAG_NAME, "html").setAttribute('theme','gab-black')
+            page = driver.find_element(By.TAG_NAME, "html").sendKeys('theme','gab-black')
             #print (dir(page))
             print (page.get_attribute('theme'))
             #driver.execute_script("innerHTML='gab-dark';",page)