Fix padding of 404 page

Author: Blargian

src/theme/NotFound/Content/index.js

@@ -0,0 +1,37 @@
+import React from 'react';
+import clsx from 'clsx';
+import Translate from '@docusaurus/Translate';
+import Heading from '@theme/Heading';
+import styles from "../styles.module.css";
+export default function NotFoundContent({className}) {
+  return (
+    <main>
+      <div>
+          <div className={styles.notFoundMain}>
+          <Heading as="h1" className="hero__title">
+            <Translate
+              id="theme.NotFound.title"
+              description="The title of the 404 page">
+              Page Not Found
+            </Translate>
+          </Heading>
+          <p>
+            <Translate
+              id="theme.NotFound.p1"
+              description="The first paragraph of the 404 page">
+              We could not find what you were looking for.
+            </Translate>
+          </p>
+          <p>
+            <Translate
+              id="theme.NotFound.p2"
+              description="The 2nd paragraph of the 404 page">
+              Please contact the owner of the site that linked you to the
+              original URL and let them know their link is broken.
+            </Translate>
+          </p>
+          </div>
+      </div>
+    </main>
+  );
+}

src/theme/NotFound/index.js

@@ -0,0 +1,17 @@
+import React from 'react';
+import {translate} from '@docusaurus/Translate';
+import {PageMetadata} from '@docusaurus/theme-common';
+import Layout from '@theme/Layout';
+import NotFoundContent from '@theme/NotFound/Content';
+export default function Index() {
+  const title = translate({
+    id: 'theme.NotFound.title',
+    message: 'Page Not Found',
+  });
+  return (
+    <>
+      <PageMetadata title={title} />
+      <NotFoundContent />
+    </>
+  );
+}

src/theme/NotFound/styles.module.css

@@ -0,0 +1,7 @@
+.notFoundMain {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    text-align: center;
+    padding-top: 10rem;
+}