Edit Site Header for Three Pages Only

Hi, Here is the code you have to put in custom css:
 

#collection-658323ea6ebb5533fc88dbe7 .header-background-solid, #collection-6589b02f549719130fe08df7 .header-background-solid, #collection-6588f7e4f48be01f828283bc .header-background-solid{
	background-color: rgba(42, 107, 172, 0.30) !important;
}

This will make the header bg 70% transparent.