Fylo dark theme landing page with hamburger menu HTML, CSS, JS

Hi, I have some questions:

• Should I use <section> tags instead of the <div> tags? I used divs to create the sections of this webpage

• I use the social media icons from this website https://boxicons.com and the svg code gives errors in the HTML file.

• I had issues with the e-mail address check. I have used a regex from stackoverflow.com and modified it so that the last part of the email can contain only 2 or 3 characters. The condition in JS doesn´t work only if @ is included in the email input field. I couldn´t find out why.

I would be glad if you could help me with these issues. :)