Frontend Mentor - Interactive card details form

Great work!

One thing I would note is that the desktop design seems to be incorrect, it is perhaps only using the mobile one.

The other thing I noticed is that you could avoid duplication in your javascript for eventhandlers.

For example, your existing code:

document.querySelector("#name").addEventListener("keyup", checkErrorsOnPress);
document.querySelector("#number").addEventListener("keyup", checkErrorsOnPress);
document.querySelector("#mm").addEventListener("keyup", checkErrorsOnPress);
document.querySelector("#yy").addEventListener("keyup", checkErrorsOnPress);
document.querySelector("#cvc").addEventListener("keyup", checkErrorsOnPress);

Could be replaced with either event delegation or a loop.

const elements = document.getElementsByTagName("input");
for (let i = 0; i < elements.length; i++) {
elements[i].addEventListener("keyup", checkErrorsOnPress);
}