Hide Header in All Pages/Content

Dear All,

I try to hide big header image in all pages content and try to add this code to my css

.blog .header-cover {
	display: none;
}

.single-post .header-cover,
body.page .header-cover {
	display: none;
}

that code only hide big header in front page, single page and page, not in result page, category page.

How to hide big header in ALL page content? Thank you