Updated the normalise css.

sass/init/_colors.scss

@@ -1,4 +1,4 @@
-// sass-lint:disable indentation, no-color-keywords
+// sass-lint:disable indentation, no-color-keywords, no-color-hex
 
 // Colors
 //
@@ -22,6 +22,7 @@ $chroma: add-colors((
   grey-light:             ('black' lighten 80%), // #ccc
   grey-extra-light:       ('black' lighten 93.33%), // #eee
   white:                  #fff,
+
   blue:                   #0072b9,
   red:                    #c00,
   green:                  #43a808,
@@ -57,6 +58,7 @@ $chroma: add-colors('functional', (
   backdrop:               'grey-extra-light',
 
   mobile-menu:            'header-bg',
+  mobile-menu-cover:      ('black' rgba .2),
 
   button:                 'nearblack',
   button-disabled:        'grey',

sass/init/clearfix/_clearfix.scss

@@ -5,8 +5,6 @@
 //
 // We use the micro-clearfix, optimized for use in `@extend` where fewer `&` is
 // better.
-//
-// Style guide: sass.mixins.clearfix
 @mixin clearfix() {
   &::before {
     content: '';

sass/init/image-url/_image-url.scss

@@ -37,8 +37,6 @@ $image-url-subdirectory: 'components' !default;
 //                   `$subdirectory`.
 // $path-to-source = $image-url-path-to-source - Optional. The relative path
 //                   from the css build directory to the sass source directory.
-//
-// Style guide: sass.mixins.image-url
 @function image-url($subdirectory, $path: null, $path-to-source: $image-url-path-to-source) {
   // If only 1 parameter is given, its value is intended for the $path.
   @if type-of($path) == 'null' {

sass/init/rtl/_rtl.scss

@@ -10,8 +10,6 @@ $include-rtl: true !default;
 // Can be turned off globally by setting `$include-rtl: false;`.
 //
 // $selector = '[dir="rtl"]' - The RTL parent selector.
-//
-// Style guide: sass.mixins.rtl
 @mixin rtl($selector: '[dir="rtl"]') {
   @if $include-rtl {
     @if & {

sass/init/visually-hidden/_visually-hidden.scss

@@ -4,8 +4,6 @@
 //
 // Make an element visually hidden, but accessible to screen readers, etc.
 // @see http://snook.ca/archives/html_and_css/hiding-content-for-accessibility
-//
-// Style guide: sass.mixins.visually-hidden
 @mixin visually-hidden {
   position: absolute !important;
   height: 1px;
@@ -18,8 +16,6 @@
 // visually-hidden--off()
 //
 // Turns off the visually-hidden effect.
-//
-// Style guide: sass.mixins.visually-hidden--off
 @mixin visually-hidden--off {
   position: static !important;
   clip: auto;
@@ -32,8 +28,6 @@
 //
 // Makes an element visually hidden by default, but visible when receiving
 // focus.
-//
-// Style guide: sass.mixins.visually-hidden--focusable
 @mixin visually-hidden--focusable {
   @include visually-hidden;