sharepoint blog - frame width of the posts

[Olaf Nennker]

hi, I created a SharePoint page (classic) for a blog.

I chosed framed as my post layout.

when I edit the webpart, I can change the width.
However, the frame for the contributions remains unchanged.

how can I adjust the frame for the posts to the width of the web part?

[#2]

@Olaf Nennker You can't change it.

The MS folks would like you to consider using a Modern Site with the News web part for your blog use case. News posts have Likes and Comments, just like blogs. And you can set up the new web part to mimic a date-style headline format for the posts. It doesn't display the full text of the news posts (like the classic blog can), however.