Black Navbar With Border

Just add .dark-nav-border class in <nav> tag

Black Navbar With Border With Search

Dark Primary Color

Add .primary-nav-dark class in <nav> tag

Dark Warning Color

Add .warning-nav-dark class in <nav> tag

Dark Success Color

Add .success-nav-dark class in <nav> tag

Dark Info Color

Add .info-nav-dark class in <nav> tag

Dark Danger Color

Add .danger-nav-dark class in <nav> tag