I could not make it work with the recommendation.

So this is what I am doing. When editing the page I get the id and then used in the CSS code like this:

.postid-774 #page-site-header {
padding: 63px 0;
background-image: none !important;
}
.postid-774 header.page-header {
display: none;
}

I added it to the CSS section and published the change, nothing happens. I do still see the Page label and the Featured Image on the page.