Footer Bugs on github website

Hi everyone,
I just take a look to CI/CD on github and when i was at the bottom of it.
I saw the differents logos of social media in a big size. I don’t think this is normal.

Go to this page, if you want to see of what 'm talking about : Continuous Integration and Continuous Delivery (CI/CD) Fundamentals | GitHub Resources

where is that ?

the screenshot is the bottom of the page


I’m on Firefox