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I ran into a problem with the border-radius. Starting at 1055px screen width it seems to flatten out and ends up looking like a regular box. I can't seem to find the source of this issue. Any help would be appreciated!

This is the first time I attempt to do a responsive page, I'm still kinda lost so I welcome any advice/comment/critique. Thanks

I don't know much about responsive design so I mainly focused on the desktop design for this project, I still tried to make it look good in mobile just using my intuition and current understanding of CSS. If someone is kind enough to point me in a direction to start learning about responsive I would really appreciate it!!