How can I fix alignment issues in my blog's header and footer?

Hi,

I just created and published the first blog post. I soon realised that the header and footer looked strange; the header has been pushed to the right leaving some empty space on the left; and the footer has be been pushed from right and left leaving a bit of empty space on both directions. This only happens on the blog page (not on other pages).

Any quick fix for that? I would appreciate some tips!

Here is a link to the blog post:

https://essuli.com/blogs/news/miten-essuli-sai-alkunsa

Cheers!

Tim