Basically it is a repo for frontendmentor.io challanges.
The whole challanges are in https://www.frontendmentor.io/challenges
And also you can see whole projects demo in
https://frontendmentor-challanges-git-master.mehmetpekcan.now.sh/
for example;
https://frontendmentor-challanges-git-master.mehmetpekcan.now.sh/project.name/index.html