Resize left and right margin

Hello together
I have some Question. For my opinion the right and left margins are too big. Where can i reduce this margins.
[margin.pdf](https://github.com/benjaminkott/bootstrap_package/files/7297197/margin.pdf)

Start with the attached margin.pdf and inspect the Bootstrap Package theme styles or layout entry points that control the page's left and right spacing. Done means identifying where those margins are set and documenting or changing the relevant setting so the displayed margins match the expected layout.

Written by the indexing model from the issue text.