Scroll down header take too mush spaces

Cloudflare learning center header take too mush spaces when scroll down:
example link: https://www.cloudflare.com/learning/cdn/what-is-a-cdn/


to compare, here is a blog which is much better:
example link: https://blog.cloudflare.com/keyless-ssl-the-nitty-gritty-technical-details/

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