Interactive card form, Mobile first

Solution retrospective
This is my eighth project for Frontend Mentor, i want improve my skills in css and js.
I have already some base in css and js but i'm not sure that i use the best practices.
If you have any advice or comments on my work, i would be happy to ear !
Thanks.
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- @Olatoyan
Nice job Théo. There's just a suggestion I'll make and that is the cardholder name field. I can input a space and it'll go through. So instead of typing a value, if I type spaces inside, I don't get any error. So I should get an error if I input any whitespaces first. Hope you can fix this. You did a really great job.
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