Add holy grail layout

client/App.jsx

@@ -4,6 +4,7 @@ import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';
 import Home from './Home';
 import Badge from './layouts/Badge';
 import Centering from './layouts/Centering';
+import HolyGrail from './layouts/HolyGrail';
 import InputAddon from './layouts/InputAddon';
 import MediaObject from './layouts/MediaObject';
 import Sidebar from './layouts/Sidebar';
@@ -18,6 +19,7 @@ const App = () => {
                 <Route exact={true} path='/'><Home /></Route>
                 <Route exact={true} path='/badge'><Badge /></Route>
                 <Route exact={true} path='/centering'><Centering /></Route>
+                <Route exact={true} path='/holy-grail'><HolyGrail /></Route>
                 <Route exact={true} path='/input-add-on'><InputAddon /></Route>
                 <Route exact={true} path='/media-object'><MediaObject /></Route>
                 <Route exact={true} path='/sidebar'><Sidebar /></Route>

client/layouts/HolyGrail.jsx

@@ -0,0 +1,87 @@
+import React from 'react';
+
+import DetailsLayout from '../DetailsLayout';
+import Block from '../placeholders/Block';
+import BrowserFrame from '../placeholders/BrowserFrame';
+import Rectangle from '../placeholders/Rectangle';
+import SampleCode from '../SampleCode';
+import useDocumentTitle from '../useDocumentTitle';
+
+const HolyGrail = () => {
+    useDocumentTitle('CSS Layout ∙ Holy grail');
+
+    return (
+        <DetailsLayout>
+            <h1 className="f1 tc">Holy grail</h1>
+            <BrowserFrame
+                content={
+                    <div className="h-100 flex flex-column">
+                        <div className="flex-shrink-0 bb b--black-30 pa3">
+                            <div className="w-50"><Rectangle /></div>
+                        </div>
+                        <div className="flex-grow-1 flex flex-row">
+                            <div className="b--black-30 br pa3 w-25">
+                                <Block numberOfBlocks={10} />
+                            </div>
+                            <div className="pa3 flex-auto">
+                                <Block numberOfBlocks={20} />
+                            </div>
+                            <div className="b--black-30 bl pa3 w-20">
+                                <Block numberOfBlocks={5} />
+                            </div>
+                        </div>
+                        <div className="flex-shrink-0 bt b--black-30 pa3">
+                            <div className="w-40"><Rectangle /></div>
+                        </div>
+                    </div>
+                }
+                source={
+<SampleCode
+lang="html"
+code={`
+<div style="
+    display: flex;
+    flex-direction: column;
+">
+    <header>
+        ...
+    </header>
+    <main style="
+        /* Take the remaining height */
+        flex-grow: 1;
+        
+        /* Layout the left sidebar, main content and right sidebar */
+        display: flex;
+        flex-direction: row;
+    ">
+        <!-- Left sidebar -->
+        <aside style="
+            width: 25%;
+        ">...</aside>
+
+        <!-- Main content -->
+        <article style="
+            /* Take the remaining width */
+            flex-grow: 1;
+        ">
+            ...
+        </article>
+
+        <!-- Right sidebar -->
+        <nav style="
+            width: 20%;
+        ">...</nav>
+    </main>
+    <footer>
+        ...
+    </footer>
+</div>
+`}
+/>
+                }
+            />
+        </DetailsLayout>
+    );
+};
+
+export default HolyGrail;