Merge pull request #3647 from alphagov/local-colour

Don’t use $yellow to indicate local environment

app/assets/javascripts/main.js

@@ -20,3 +20,7 @@ $(() => GOVUK.modules.start());
 $(() => $('.error-message').eq(0).parent('label').next('input').trigger('focus'));
 
 $(() => $('.banner-dangerous').eq(0).trigger('focus'));
+
+$(() => $('.govuk-header__container').on('click', function() {
+  $(this).css('border-color', '#005ea5');
+}));