CSS for animated site Header

Hello i'm trying to emulate this site where when you hover over a site page a dot appears on the left,

I've managed to get the line above the header but no luck for the dot on the left 

Link to website i'm emulating is attached! https://brydellpartners.com/ 

Thanks!

Can you provide a link to the website you are building?  If it's still in development, just set visibility to password protected and provide the password as well.