I have a blog about literature, and the post page looks that way
https://www.inspiracionyficcion.com.ar/post/pasando-paginas

But recently I noticed you have a template with no borders in the post page.
This is a screenshot of the blog post.

I have tried but I couldn't find the way to edit the borders of the post page. I want them to be white, so it can't be seen. Please help me to change it, I don't know how can I do that.
Hi Laura!
Please in site pages panel access Blog Post Page --> Design --> Post --> Border color & opacity
Please read here more: https://support.wix.com/en/article/customizing-the-post-page-in-the-new-wix-blog