Dashed margins

Hello. I’m currently using Atahualpa template and I’m really enjoing it, it’s super!
I just have a little issue about the dashed margins showing on my blog.
I’d like to remove them and I already edited all the theme files removing the “Dashed” lines. But they are still there! Is there a way to resolve my problem?
I’m pretty new to php coding and html in general so I’d really appreciate a little help here.

Thank you in advance.