Progress not saved when offline

I’ve just done 21 of the basic html and html 5 lessons to complete that section but I was offline so my progress wasn’t saved. Bizarrely, my browser was able to continue loading each new lesson but nothing was saved. I was logged in. Now it looks like I have a big hole in my learning. Is there a way to retroactively check the box that I’ve done it?
Thanks

the only way is to solve them again

you can ignore it, missing challenges will not halt your progress, the only mandatory part pf the curriculum is the projects

Ok that’s good to know.
Thanks ieahleen.