Add progress bar

client/layouts/progress-bar/Cover.jsx

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+import React from 'react';
+
+import Frame from '../../placeholders/Frame';
+
+const Cover = () => {
+    return (
+        <Frame>
+            <div className="h-100 flex flex-column items-center justify-center pa2">
+                <div className="h1 w-100 br-pill bg-black-10 pa1">
+                    <div className="w-40 br-pill h-100 bg-blue" />
+                </div>
+            </div>
+        </Frame>
+    );
+};
+
+export default Cover;

client/layouts/progress-bar/Details.jsx

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+import React, { useState } from 'react';
+
+import DetailsLayout from '../../DetailsLayout';
+import BrowserFrame from '../../placeholders/BrowserFrame';
+import SampleCode from '../../SampleCode';
+import useDocumentTitle from '../../useDocumentTitle';
+import useInterval from '../../hooks/useInterval';
+
+const Details = () => {
+    useDocumentTitle('CSS Layout ∙ Progress bar');
+    const [progress, setProgress] = useState(0);
+    useInterval(() => {
+        setProgress(v => v === 100 ? 0 : v + 1);
+    }, 1 * 100);
+
+    return (
+        <DetailsLayout>
+            <h1 className="f1 tc">Progress bar</h1>
+            <BrowserFrame
+                content={
+                    <div className="h-100 flex flex-column items-center justify-center">
+                        <div className="h1 w-50 br-pill bg-black-10">
+                            <div className="br-pill h-100 bg-blue flex items-center justify-center pa1 white f7" style={{ width: `${progress}%` }}>
+                                {progress}%
+                            </div>
+                        </div>
+                    </div>
+                }
+                source={
+<SampleCode
+lang="html"
+code={`
+<div style="
+    /* Colors */
+    background-color: rgba(0, 0, 0, .1);
+
+    /* Rounded border */
+    border-radius: 9999px;
+">
+    <div style="
+        /* Content is centered */
+        align-items: center;
+        display: flex;
+        justify-content: center;
+
+        /* Colors */
+        background-color: #357edd;
+        color: #fff;
+
+        /* Rounded border */
+        border-radius: 9999px;
+
+        /* Width based on the number of percentages */
+        width: 40%;
+    ">
+        <!-- The number of percentages -->
+        40%
+    </div>
+</div>
+`}
+/>
+                }
+            />
+        </DetailsLayout>
+    );
+};
+
+export default Details;