You can change a style of header by using Layouts in Wordpress Dashboard.
When you'll make a new layout, you have to go to your edit your page you want to have different menu and on the bottom of settings you'll find an option named Custom | Layout, set it to your custom layout (http://prntscr.com/jue41s)
But, you can't change color of header using BeTheme Options.
I need the menu to be different ONLY on blog and blog posts: here on this page for example the menu should have a white background and a a smaller width (for example 800px)
I don't understand which code you refer to when you say that is going to destroy menu. The dangerous one is the css for color or css for width? Can I safely use css code you sent before?
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