Where can I modify the width to be proportional to the window?

[42jerrykim]

When using a large monitor, the width is narrow, so it looks strange.

Where can I modify the width to be proportional to the window?

Environment

• Minimal Mistakes version:
• Ruby gem or remote theme version:
• Jekyll version:
• Git repository URL: https://github.com/Reevid/Reevid.github.io
• GitHub Pages hosted (if yes provide URL to site): https://reevid.github.io/
• Operating system:

Expected behavior

Steps to reproduce the behavior

Other