Twenty Sixteen Full Width Single Post

try:

/*NO SIDEBAR AND FULL WIDTH IN SINGLE POST*/
@media screen and (min-width: 56.875em) {
	#secondary { display: none; }
	.single-post .content-area
	{
	  float: left;
	  margin-right: -100%;
	  width: 100%;
	}
}

in style.css of a child theme or via a custom CSS plugin..

Thanks Michael. I have added this to custom CSS but nothing is happening.

did you clear the browser cache?

reload the web page, or whatever your browser needs (possibly press CTRL F5)

could you post a link to your site to allow troubleshooting?

do you want to remove the wide margin/padding on either side of the middle?

unfortunately, right now, I can’t see any good solution for that which would also take care of the images below the content.

I want to remove the whitespace on the left hand (where the meta tags such as author and date are).