White line under the header

Hello.

First, I want to thank everyone who is working on this theme. This theme is great. And thank you very much for technical support.

On my site there is some kind of white line under the header. At first I did not understand where it came from, but I liked it.

The problem is that it is not on the posts page. Tell me, how can I create it there?

оркестрмедь.рф

Thanks in advance for your help.

Hello there,

Try adding the below CSS code to Appearance > Customize > Additional CSS from dashboard.

    .header-promo {
      display: none;
    }

Regards,
Kharis

Sorry, because of my bad English, I incorrectly explained my problem. I want a white line on all pages.

It is necessary that the white line appears on the posts page

Hello there,

Try this code:

.hentry,
.hentry:first-of-type {
  border: none !important;
}

Regards,
Kharis

Unfortunately, this is not what I need. Please look at the screenshots.

Hello there,

Have you applied this code?

.header-promo {
  display: none;
}

.hentry,
.hentry:first-of-type {
  border: none !important;
}

Regards,
Kharis

Sorry, this is not what I need.
This code hides the white line on all pages. And I need it to appear on the posts page.

Hello there,

Try this code:

    body:not(.home) .header-promo {
      display: none;
    }

    body:not(.home) .hentry,
    body:not(.home) .hentry:first-of-type {
      border: none !important;
    }

Regards,
Kharis

I think I understand what I need

I need to add header-promo to the Posts Page. But how to do that?