Additional css for presentation layer as per pdf v5

css/styles.css

source/_patterns/03-layouts/header/_header.scss

source/_patterns/03-layouts/header/header.twig

.../_patterns/03-layouts/site-container/_site-container.scss

...e/_patterns/03-layouts/site-container/site-container.twig

...ce/_patterns/03-layouts/site-container/site-container.yml

...atterns/04-components/menu/menu--header/menu--header.twig

...4-components/menu/menu--horizontal/_menu--horizontal.scss

...04-components/menu/menu--horizontal/menu--horizontal.twig

...ce/_patterns/04-components/menu/menu--main/menu--main.yml

.../04-components/menu/menu--secondary/_menu--secondary.scss