I have built my website using WordPress with the Divi Child Theme, but I am experiencing a Flash of Unstyled Content (FOUC) issue. The header appears unstyled for a moment before the full design is applied.

You can check the issue on my website: /

What I Have Tried So Far: I have already tried the following solutions, but none of them fully resolved the issue:

Disabled "Load Stylesheets Asynchronously" in Divi settings. Adjusted caching settings in WP Fastest Cache:

Enabled: Minify CSS Disabled: Combine CSS Checked for render-blocking issues. Added a preloader to delay content visibility until CSS is fully loaded. Disabled optimization plugins like Autoptimize, but the issue persists.

How can I completely eliminate FOUC and ensure that the header and styles are fully applied before displaying the page?

Any help would be greatly appreciated.