Hello converted a bootstrap site to flex box  having a problem with relative links not jumping to section headers how can i force relative links to jump to section headers  code pen https://codepen.io/eugenemdonaghy/pen/JoRaYYO  

link https://www.eugenemdonaghy.co.uk/flex/links.html to see what I mean and what I want

You codepen is working

Your site returns an SSL error

It looks like you used a coding tool (maybe AI)  to do the conversion. You have ended up with some pretty clunky code. And the UI is really bad on a phone.

Your new site fails HTML validation 

And your current site is not valid CSS.