Rechallenge/Review: Intro component with sign-up form

(I translated the sentences into English using 'translate.google.com'. Please understand if there are any strange grammar.)

Hello!

This time, I tried the previous challenge again! When I tried this time, I focused a little more on Javascript.

I wanted to reduce duplication when writing scripts. Nevertheless, the amount of scripts seems to have increased compared to the last time ^^; I'm so happy that the script was written just the way I thought it would!

However, I am wondering if there is a way to reduce it even further here.

Thanks for reading. :D If you have any other suggestions or solutions to the above problems, please feel free to let us know!

Comments always improve my learning!