A bar appears when the screen width changes to 1200px, why is that?

Question

Media queries

I am learning to make adaptive layout, with a screen width of 1200px, an indent appears from the right edge of the screen, I checked margin and padding, I did not understand why
https://alexeysinitisin.github.io/scale1/

Answer 1

You have a fixed width in pixels in .footer__conteiner and .season18__button