When I click on the 'Submit' button, the code isn't responsive. It keeps on buffering and I've tried anything that I could think of- changing browsers, clearing history, etc. I don't think the code is wrong because it's just the first lesson, where I just look at the code and click the 'submit' button to move on to the next lesson.
Does your code say to take user input? If so, it'll wait for the user, you, to provide input before it continues.