Front-end/Back-end Kanban Task Management

I've reused the design on the sidebar for smaller screen as well just filling the entire available space and used some MuiMaterial components and icons. Also, I've developed both front and back-end (not what I like to do, but it's nice to have a minimum knowledge on it) using node, express and mongodb. Whoever make any change on the data will reflect for everybody else as I didn't implement it to support different users.

This is my first time uploading a back-end application to the server myself, I hope everything work just fine for everybody haha.

Any feedback is much appreciated =)