BuddyPress.org

Hello,
first of all, bravo for your amazing plugin whose potentialities I am just beginning to discover.
I would like to know if there is a simple way to fix the lack of appearance consistency between my links “log in” and “register”.
The problem can easily be seen on the right of my website here : https://www.lescahiersdelinnovation.com.
I have tried myself but don’t know how to start to fix this issue.
Best regards and thank you.