Responsive intro-component-with-sign-up-form with Flexbox

Hello everyone, Here is my solution for the intro-component-with-sign-up-form project. I only used flexbox for the CSS. I'm quite proud of myself because this is my first project with JavaScript. I think it meets the request unless I am mistaken. There are of course improvements to be made and I am aware of them, but for a first: It does. As usual, I had problems with the Responsive Design. I don't know why but it doesn't want to fit in despite there being concepts that I acquired. I have to keep doing it and hanging on. Good day to all.