blog page without sidebar

I want to remove the sidebar from all over the site and have full-width pages, including the blog page and the page of each article.
Thank you.

 

Hello Marialberti,

For this sending "blog.php" and "single.php". Replace with your existing files.

And after that

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.page-content .content-bar .post {
margin-right: 15px;
}
#nav-single {
margin-right: 15px;}

Thanks & Regards
Nitesh Raghuwanshi

 

Thank you.
You are very kind.