Issue With Preloader Component: Pages Still Popping Up Despite Code

Hey, I got another question regarding the preloader component, it states in the component instructions that I should put this code snippet: <style> .preloader { display: flex; }</style> in the custom code in site settings to prevent the desired page briefly popping up before the preloader animation I did all that but the pages still randomly pop up. You got any idea why that is happening? The first code line, which is blacked out, is for the cookie banner