Reorganize folders

client/patterns/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/patterns/notification/Details.jsx

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+import React from 'react';
+
+import DetailsLayout from '../../layouts/DetailsLayout';
+import Block from '../../placeholders/Block';
+import BrowserFrame from '../../placeholders/BrowserFrame';
+import Circle from '../../placeholders/Circle';
+import SampleCode from '../../SampleCode';
+
+const Details = () => {
+    return (
+        <DetailsLayout title="Notification">
+            <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' }}>
+                                <Circle />
+                            </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;