Walkerem

Hello! I am wondering how to change the background colour of the site header just for blog posts only? The rest of my website is a dark theme, but I have a white background for blog posts which makes the logo in the site header disappear. I have tried using a few variations of .collection-type-blog-basic.view-item header#header { background: black; } and .collection-type-blog-basic-grid.view-item .header-announcement-bar-wrapper { background: black !important; } but nothing seems to be working. Thanks so much for your guidance!