how can I adjust author profile part(left) sidebar or margin?

[rojae1339]

this is my full screen(a bit edited)

right side bar, I could reduce margin of it with edit _archive.scss and _page.scss

but idk how to adjust left part.. :'3
i tried yaml frontmatter with
classes: wide
these kind of things, but i couldn't do it..

I would be happy if I can solve this problem... thank you