Custom 404 page

declarations.d.ts

@@ -1 +1,6 @@
-declare module "*.svg"
+declare module "*.svg"
+
+declare module '*.css' {
+  const content: { [className: string]: string };
+  export = content;
+}

src/App.tsx

@@ -1,4 +1,5 @@
 import Redirect from './technical/routing/redirect';
+import PageNotFound from './pages/404';
 
 import LoginPage from './pages/login-stuff/login/login';
 import SignUpPage from './pages/signup/signup';
@@ -45,6 +46,7 @@ const App = () => {
                             <Route path='/login' element={<LoginPage />} />
                             <Route path='/signup' element={<SignUpPage />} />
                         </>)}
+                        <Route path='*' element={<PageNotFound />} /> {/* 404 page for all other routes */}
                     </Routes>
                 </ThemeProvider>
             </ScrollReset>

src/fonts/quantico/OFL.txt

@@ -0,0 +1,93 @@
+Copyright (c) 2011, Matthew Desmond (http://www.madtype.com | mattdesmond@gmail.com),with Reserved Font Name Quantico.
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

src/index.css

@@ -28,6 +28,13 @@
     src: url('./fonts/heebo/Heebo-VariableFont_wght.ttf');
 }
 
+/* Quantico: question mark font for the page not found page */
+@font-face {
+  font-family: 'Quantico';
+  font-weight: 400;
+  src: url('./fonts/quantico/Quantico-Regular.ttf');
+}
+
 :root {
     /*global fixed colors and fonts*/
     /*colors*/
@@ -55,6 +62,9 @@
     --font-user-content: 'M PLUS 1', sans-serif;
     --font-highlight: 'Rubik', sans-serif;
     --font-heading: 'Heebo', sans-serif;
+    --font-large-question: 'Quantico', sans-serif;
+    /* border radii */
+    --border-radius: 4px;
 }
 
 /*global color variables for different visual modes (can be used with the var() expression)*/

src/pages/404.tsx

@@ -0,0 +1,53 @@
+import React, { FC, useState } from 'react';
+import { Link } from 'react-router-dom';
+import { useSelector } from 'react-redux';
+import '../styles/404.css';
+import memoriterLogoWhite from '../images/memoriter-logo-white.svg';
+import memoriterLogoBlack from '../images/memoriter-logo-black.svg';
+
+// this page is shown when no other page can be rendered
+
+const PageNotFound: FC = (): React.ReactElement => {
+  const [onHover, setOnHover] = useState<string>('brightness(1)'); // variable for the hover effect for the get started button
+
+  const theme: string = useSelector((state: any) => state.theme.value); // current light or dark mode icon based on theme
+
+  return (
+    <>
+      {/* container with content */}
+      <main className={'page-not-found'}>
+        {/* large question mark next to the text */}
+        <section className={'page-not-found-question-mark'}>?</section>
+
+        {/* extra div is important for layout */}
+        <section>
+          {/* logo above the content */}
+          <img
+            className={'page-not-found-logo'}
+            src={theme === 'dark' ? memoriterLogoWhite : memoriterLogoBlack}
+            alt='Memoriter'
+          />
+          {/* text */}
+          <h1>Page Not Found!</h1>
+          <p>
+            This URL does not match any page. Please use another link or go back to an existing
+            page.
+          </p>
+
+          {/* button redirects to product page */}
+          <Link
+            className={'page-not-found-button'}
+            to='/'
+            onMouseEnter={() => setOnHover('brightness(0.75)')}
+            onMouseLeave={() => setOnHover('brightness(1)')}
+          >
+            {/* the onMouseEnter and -Leave is for the fade effect on hover which was not possible in CSS */}
+            Return to Website!
+            <div className={'page-not-found-button-background'} style={{ filter: onHover }} />
+          </Link>
+        </section>
+      </main>
+    </>
+  );
+};
+export default PageNotFound;