I would like feedback on my survey

You can view my survey here https://codepen.io/Bosris/pen/jXbPaq

What could I have done better?

I know one, make it responsive. Gotta figure how to do that again xD

Yes, just having a message pop-upp or displayed after the submit button is pressed would be nice

nice job with the survey page!!

Can I suggest making your checkboxes clickable via their labels:

<label for"feedback">
    <input for="feedback" id="front-end" value="Back-end-Projects" type="checkbox">
    Back-end Projects

it was mentioned briefly here