Show HN: Check Project Euler solutions (not complete) (project-euler-solution.herokuapp.com)

I threw this together pretty quickly since it doesn't look there's a good way to check Project Euler solutions, so it is flawed in a number of ways (for one, I don't have an answer to every problem). Feedback is greatly appreciated since I'm pretty new to web dev even for something this basic.

Github repo here: https://github.com/singularperturbation/project-euler-soluti...