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HTML

              
                mixin image 
  div.c-page-header__image
    img(src="https://images.pexels.com/photos/179845/pexels-photo-179845.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260")
mixin title(text)
  h1.c-page-header__title.h-text--h1
   span.c-page-header__keyword
   span.c-page-header__title-text= text
mixin date(text)
  time.c-page-header__date.h-text--extra-large= text
mixin pretitle(text)
  span.c-page-header__pretitle.h-text--pretitle= text

mixin nav(...items)
  nav.c-page-header__nav.c-nav.c-nav--secondary.h-text--h6.h-text--black
    ul.c-nav__list
      each item in items
        li.c-nav__item
          a(href="#").c-nav__link= item

mixin quote(quote,cite,rating)
  div.c-page-header__quote.h-only-desktop

mixin subnav
  section.c-page-header__subnav
      //include subnav
mixin infobar
  section.c-page-header__infobar
    span.o-container.o-page-grid
      time.c-page-header__date.h-text--h4.o-page-grid__item--sidebar
       //infobar
      a(href="#datesandtimes").o-page-grid__sidebar.c-page-header__action.o-button.o-button--outline.o-button--mega Choose dates &amp; Book
  
  
body#app
  div.o-page-grid.o-container
    header.c-page-header.o-grid__item--full.c-page-header--hero
      +image
      div.c-page-header__container.o-container
        +title('Hero header title text')
        +pretitle("Category")
        +nav('Calendar','Access','Listings')
              
            
!

CSS

              
                .c-page-header {
  //list all elements in page header
  @include template(title, pretitle, nav);
  &--hero {
    .c-page-header__container {
      display: grid;
      grid-template-columns: 7fr 1fr 4fr; //sidebar is 4fr so let's sit the nav over a possible sidebar
      grid-template-areas:
        "pretitle . ."
        "title    . nav";
      @include media(tablet) {
        grid-template-columns: 8fr 4fr; //2/3 on tablet
        grid-template-areas: "pretitle ." "title ." ". nav";
      }
      @include media(phone) {
        grid-template-columns: 1fr;
        grid-template-areas: "pretitle" "title" "nav"; //full on phone
      }
    }
  }
  
  
  // elements of header
  
  //hm, budge this nav over to bottom right
  &__nav {
    @include media(desktop) {align-self:end}
    > * { margin: 0}
  }
  
  &__image {
    position: relative;
    overflow: hidden;
    img {
      width: 100%;
      transform: translateY(-33vw);
      margin-bottom: calc(-33vw + #{$b} );
      //I just budged this up to make this dummy image a better crop -- in production the images are sized in Imager
    }
  }
}

              
            
!

JS

              
                
              
            
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999px

Console