X.com (Twitter) icon is not visible

[glasseszoom0p]

I’ve created a site: https://glasseszoom0p.github.io/. It’s a fork of the jekyll/minima repository, and I’ve only changed the _config.yml file. You can view the GitHub repository here: https://github.com/glasseszoom0p/glasseszoom0p.github.io/tree/master. As you can see on the site, the X.com (formerly Twitter) icon at the bottom is not visible, although it is visible when I run it locally on my computer