microsite: add Banner component + k8s launch banner

microsite/core/Components.js

@@ -106,9 +106,29 @@ const Breakpoint = ({ narrow, wide }) => (
   </React.Fragment>
 );
 
+const Banner = simpleComponent('div', 'Banner', ['hidden']);
+Banner.Container = simpleComponent('div', 'Banner__Container');
+
+const BannerDismissButton = simpleComponent(
+  props => (
+    <svg {...props} data-banner-dismiss viewBox="0 0 24 24">
+      <path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z" />
+    </svg>
+  ),
+  'Banner__DismissButton',
+);
+
+Banner.Dismissable = ({ storageKey, children }) => (
+  <Banner hidden data-banner={storageKey}>
+    {children}
+    <BannerDismissButton />
+  </Banner>
+);
+
 module.exports = {
   Block,
   ActionBlock,
   Breakpoint,
   BulletLine,
+  Banner,
 };

microsite/pages/en/index.js

@@ -11,6 +11,7 @@ const Block = Components.Block;
 const ActionBlock = Components.ActionBlock;
 const Breakpoint = Components.Breakpoint;
 const BulletLine = Components.BulletLine;
+const Banner = Components.Banner;
 
 class Index extends React.Component {
   render() {
@@ -53,6 +54,15 @@ class Index extends React.Component {
           </Block.Container>
         </Block>
 
+        <Banner.Container>
+          <Banner.Dismissable storageKey="k8s-launch">
+            🎉 New feature: Kubernetes for service owners.{' '}
+            <a href="https://backstage.io/blog/2021/01/12/new-backstage-feature-kubernetes-for-service-owners">
+              Learn more.
+            </a>
+          </Banner.Dismissable>
+        </Banner.Container>
+
         <Block small className="stripe-top bg-black">
           <Block.Container wrapped>
             <Block.TextBox>

microsite/siteConfig.js

@@ -82,6 +82,7 @@ const siteConfig = {
     'https://buttons.github.io/buttons.js',
     'https://unpkg.com/medium-zoom@1.0.6/dist/medium-zoom.min.js',
     '/js/medium-zoom.js',
+    '/js/dismissable-banner.js',
   ],
 
   // On page navigation for the current documentation page.

microsite/static/css/custom.css

@@ -1035,6 +1035,55 @@ code {
   }
 }
 
+.Banner {
+  position: relative;
+  padding: 14px;
+  margin: 14px 20px;
+  border-radius: 4px;
+  background-color: $primaryColor;
+  font-family: Helvetica Neue, sans-serif;
+  color: #000;
+}
+
+.Banner--hidden {
+  opacity: 0;
+  transition: opacity 200ms ease-in-out;
+}
+
+.Banner a {
+  color: #000;
+  text-decoration: underline;
+}
+
+.Banner__Container {
+  position: relative;
+  overflow: visible;
+  z-index: 100;
+
+  max-width: 1430px;
+  height: 0;
+  margin: -14px auto 14px auto;
+}
+
+.Banner__DismissButton {
+  position: absolute;
+  display: flex;
+  right: 8px;
+  top: 0;
+  bottom: 0;
+  margin: auto;
+
+  border-radius: 50%;
+  padding: 6px;
+  width: 36px;
+  height: 36px;
+  cursor: pointer;
+}
+
+.Banner__DismissButton:hover {
+  background: rgba(0, 0, 0, 0.2);
+}
+
 .logos-mobile-background {
   position: absolute;
   width: 200vw;

microsite/static/js/dismissable-banner.js

@@ -0,0 +1,18 @@
+window.addEventListener('DOMContentLoaded', () => {
+  const banners = document.querySelectorAll('[data-banner]');
+  banners.forEach(banner => {
+    const storageKey = `hideBanner/${banner.getAttribute('data-banner')}`;
+
+    if (!localStorage.getItem(storageKey)) {
+      banner.classList.remove('Banner--hidden');
+    }
+
+    const dismissButton = banner.querySelector('[data-banner-dismiss]');
+    if (dismissButton) {
+      dismissButton.addEventListener('click', () => {
+        banner.classList.add('Banner--hidden');
+        localStorage.setItem(storageKey, 'true');
+      });
+    }
+  });
+});