Base Apparel email form using match()

I had trouble in these three areas:

When the button is pressed the valid or invalid notice will come up. However it will not change if the text is change unless the page is refreshed. It seems that the function can only be called once?

The blue border on the input box. Apparently when adjusted in :active or :focus states it does not change. How do I get rid of it?

I`m having trouble with github pages. Whenever the button is pressed it just takes to a 404 page. That does not help demonstrate the work I did. How do I adjust this?