Social media dashboard with theme switcher

Hi, Could you please have a look on BEM I used in the challenge? Does the name of the classes make sense? This is my 3rd project with BEM... Is there any other method how to code a rounded item inside the toggle button? I create <div> inside <button> How can I move the content to the middle of the page without cutting the top grey background on right and left side?

I would appreciate any feedback from you.

Thank you and Happy Christmas for all of you :)