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HTML

              
                div.o-grid
  header.c-page-header.c-page-header--even
    h1.c-page-header__title Title title
    p.c-page-header__subtitle Subtitle or tagline
    time.c-page-header__datetime Monday 10 Oct
    button.c-page-header__action Action

  div.spacer
              
            
!

CSS

              
                @mixin grid($cols, $gutter) {

	display: grid;
	grid-template-columns: [full-start] repeat($cols,1fr) [full-end];
	grid-gap: $gutter;

	// default to full width PLEASE RETAIN THIS OR EVERYTHING BREAKS
	> * { grid-column-end: span $cols; }
}
@mixin template($elements...) {
  @each $element in $elements {
    &__#{$element} {
      grid-area: $element;
    }
  }
}
$b: 1.25rem; // base spacing unit of site
$cols: 12; // parent grid has 12 cols

@mixin alignToParent($map){
  $i: 1; // start the count at 1 for items in map
  $m: 0; // set multiplier to 0 as first margin is always 0
  $g: $b/$cols; // gutter is the base spacing unit divided by the number of cols in the parent grid
  @each $key, $value in $map {
    &__#{$key} {
      margin-left:calc(#{$g} * #{$m});
      $m: $m + $value; //add the current fr unit to pass to the next element as multiplier
      $r: $cols - $m; //right hand margin is the inverse, so subtract from number of $cols
      margin-right:calc(#{$g} * #{$r});
      @if $i == length($map) { //if we have reached the end of the columns we set the margin to 0
        margin-right: 0; 
      } @else {
        $i: $i + 1; //otherwise increment our counter and go round again
      }
    }
  }
 }



// GRID OBJECT
.o-grid {
	@include grid(12, $b);

	& .o-grid {
		width: 100%;
	}
}

// named area region into number area

.c-page-header {
  display:grid;
  grid-gap:0;
  @include template(title, subtitle, datetime, note, action);
  align-items:center;
  grid-template-columns: 5fr 1fr 3fr 3fr;
  grid-template-areas: "title subtitle datetime action";
  // calculate margins with mixin
  $assign: (title: 5, subtitle: 1, datetime: 3, action: 3);
  @include alignToParent($assign);
  
}
// elements
.c-page-header  {
  $p: &;
font:1em Futura,sans-serif;
  
  >* {background: pink; height:100%; word-wrap: break-word; overflow:hidden}
    
  }
  


.spacer {min-height:50vh}
              
            
!

JS

              
                
              
            
!
999px

Console