404 Redirect on Exported Folder Pages

I have exported my website and I am hosting in externally, however, I am having getting the 404 redirect to trigger with the correct stylesheets on foldered pages. For example, it works fine for website.com/page but the stylesheet for the custom 404 page doesn’t pull through for website.com/folder/page.

Does anyone have any ideas why that could be – would I need to add the stylesheet to every page or would I have to reword my .htaccess file?

I have attached my current .htaccess file below:

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.*)$ $1.html [NC,L]

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php [NC,L]