Huddle landing page with curved sections

This is my first time doing a full landing page that has a <header>,<main> and <footer> thats why my code is messed up.

In this challenge, I learned how to edit svg in html and css (viewBox and fill) and using pseudo-elements (::before and ::after). I'm also unsure in coding <input> so please of you see some mistake please let me know :).

I'll practice more coding a full landing page on my next challenges until i get comfortable. Please feel free to comment if you see some minor/major mistake so I can do better every challenges. Thank you <3