Add notification

client/layouts/notification/Cover.jsx

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+import React from 'react';
+
+import Frame from '../../placeholders/Frame';
+import Rectangle from '../../placeholders/Rectangle';
+
+const Cover = () => {
+    return (
+        <Frame>
+            <div className="h-100 flex flex-column items-center justify-center">
+                <div className="flex items-center justify-between ba b--black-30 br2 w-80 pa2">
+                    <div className="w-60"><Rectangle /></div>
+                    <div className="black-70">&times;</div>
+                </div>
+            </div>
+        </Frame>
+    );
+};
+
+export default Cover;

client/layouts/notification/Details.jsx

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+import React from 'react';
+
+import DetailsLayout from '../../DetailsLayout';
+import Block from '../../placeholders/Block';
+import BrowserFrame from '../../placeholders/BrowserFrame';
+import SampleCode from '../../SampleCode';
+import useDocumentTitle from '../../hooks/useDocumentTitle';
+
+const Details = () => {
+    useDocumentTitle('CSS Layout ∙ Notification');
+
+    return (
+        <DetailsLayout>
+            <h1 className="f1 tc">Notification</h1>
+            <BrowserFrame
+                content={
+                    <div className="h-100 flex flex-column items-center justify-center">
+                        <div className="b--black-30 ba br2 flex justify-between w-60">
+                            <div className="pa3 w-80"><Block numberOfBlocks={5} /></div>
+                            <button className="black-30 bn f2 flex h2 items-center justify-center w2" style={{ marginRight: '1px' }}>
+                                <svg
+                                    viewBox="0 0 24 24"
+                                    style={{
+                                        stroke: 'rgb(0, 0, 0)',
+                                        fill: 'none',
+                                        strokeWidth: 1,
+                                        strokeLinecap: 'round',
+                                        strokeLinejoin: 'round',
+                                        height: '16px',
+                                        width: '16px'
+                                    }}>
+                                        <path d="M12,0.5c6.351,0,11.5,5.149,11.5,11.5S18.351,23.5,12,23.5S0.5,18.351,0.5,12S5.649,0.5,12,0.5z M7,7l10,10 M17,7L7,17" />
+                                </svg>
+                            </button>
+                        </div>
+                    </div>
+                }
+                source={
+<SampleCode
+lang="html"
+code={`
+<div style="
+    display: flex;
+    justify-content: space-between;
+">
+    <!-- Content -->
+    ...
+
+    <!-- Close button sticks to the right -->
+    ...
+</div>
+`}
+/>
+                }
+            />
+        </DetailsLayout>
+    );
+};
+
+export default Details;