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Improve 404 Page Design and Mobile Responsiveness #484

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16db6eb
Improve 404 page design and mobile responsiveness
kurraharshitha Feb 11, 2026
749d1d2
Fix 404 page to work with Jupyter Book template
kurraharshitha Feb 11, 2026
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207 changes: 37 additions & 170 deletions DISCOVER/404.html
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Original file line number Diff line number Diff line change
@@ -1,170 +1,37 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>404 - Not Found</title>
<style>
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
height: 100vh;
background: linear-gradient(135deg, black, #e4f0ff);
display: flex;
align-items: center;
justify-content: center;
font-family: 'Segoe UI', sans-serif;
overflow: hidden;
position: relative;
}

.light-blur {
position: absolute;
width: 500px;
height: 500px;
background: radial-gradient(circle at center, transparent);
border-radius: 50%;
filter: blur(80px);
top: 20%;
left: 10%;
animation: drift 10s ease-in-out infinite alternate;
z-index: 0;
}

@keyframes drift {
0% { transform: translate(0, 0); }
100% { transform: translate(60px, 30px); }
}

.glass-card {
background: rgba(255, 255, 255, 0.25);
backdrop-filter: blur(12px);
-webkit-backdrop-filter: blur(12px);
padding: 2.5rem 3rem;
border-radius: 20px;
border: 1px solid rgba(255, 255, 255, 0.3);
max-width: 500px;
text-align: center;
z-index: 1;
box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

h1 {
font-size: 2.5em;
color: rgb(52, 51, 51);
margin-bottom: 0.5rem;
}

p {
font-size: 1.1em;
color: rgb(52, 51, 51);
margin-bottom: 1.4rem;
}

a {
display: inline-block;
margin: 0.4rem;
padding: 0.6rem 1rem;
border-radius: 8px;
text-decoration: none;
background: #d0bfff;
color: #1f1f1f;
font-weight: 600;
transition: background 0.3s ease;
}

a:hover {
background: #c1aaff;
}

select {
margin-top: 1rem;
padding: 0.5rem;
border-radius: 6px;
border: 1px solid #ccc;
font-size: 1em;
background: #fff;
}
</style>
</head>
<body>
<div class="light-blur"></div>
<div class="glass-card">
<h1 id="title">404 - Page Not Found</h1>
<p id="message">This page might’ve wandered off or was never here at all.</p>
<p id="suggestion">Maybe it was deleted, renamed, or never existed in the first place.</p>
<p><strong id="what-do">What can you do?</strong></p>
<a href="./intro.html" id="home">⬅️ Back to Home</a>
<a href="https://github.com/numfocus/DISCOVER-Cookbook/issues" id="report">🐞 Report the Issue</a>

<div>
<label for="language-switcher" style="display:block; margin-top:1.5rem; color:#444;">🌐 Switch Language:</label>
<select id="language-switcher">
<option value="en">English</option>
<option value="es">Español</option>
</select>
</div>

<p id="footer" style="margin-top: 1.2rem;">If you think this is an error, let us know by creating an issue.</p>
</div>

<script>
const translations = {
en: {
title: "404 - Page Not Found",
message: "This page might’ve wandered off or was never here at all.",
suggestion: "Maybe it was deleted, renamed, or never existed in the first place.",
whatDo: "What can you do?",
home: "⬅️ Back to Home",
report: "🐞 Report the Issue",
footer: "If you think this is an error, let us know by creating an issue."
},
es: {
title: "404 - Página no encontrada",
message: "Esta página se ha perdido o nunca existió.",
suggestion: "Tal vez fue eliminada, renombrada o nunca existió.",
whatDo: "¿Qué puedes hacer?",
home: "⬅️ Volver al inicio",
report: "🐞 Informar del problema",
footer: "Si crees que esto es un error, infórmanos creando un issue."
}
};

function detectLanguage() {
const pathLang = location.pathname.split("/")[1];
const refLang = new URL(document.referrer || "", location.origin).pathname.split("/")[1];
const storedLang = localStorage.getItem("preferredLang");
return translations[pathLang]
? pathLang
: translations[refLang]
? refLang
: translations[storedLang]
? storedLang
: "en";
}

function applyLanguage(lang) {
const t = translations[lang] || translations["en"];
document.getElementById("title").textContent = t.title;
document.getElementById("message").textContent = t.message;
document.getElementById("suggestion").textContent = t.suggestion;
document.getElementById("what-do").textContent = t.whatDo;
document.getElementById("home").textContent = t.home;
document.getElementById("report").textContent = t.report;
document.getElementById("footer").textContent = t.footer;
document.getElementById("language-switcher").value = lang;
localStorage.setItem("preferredLang", lang);
}

const initialLang = detectLanguage();
applyLanguage(initialLang);

document.getElementById("language-switcher").addEventListener("change", function () {
applyLanguage(this.value);
});
</script>
</body>
</html>
{% extends "sphinx_book_theme/layout.html" %}

{% block content %}

<div style="text-align:center; padding:60px 20px;">
<h1 style="font-size:80px; color:#2e7d32; margin-bottom:10px;">404</h1>
<h2>Oops! Page not found</h2>

<p style="max-width:500px; margin:20px auto; color:#555;">
The page you are looking for doesn't exist or has been moved.
Let's get you back to the DISCOVER Cookbook.
</p>

<a href="/" style="
background:#2e7d32;
color:white;
padding:12px 24px;
border-radius:8px;
text-decoration:none;
margin:10px;
display:inline-block;">
Go Home
</a>

<a href="/intro.html" style="
border:2px solid #2e7d32;
color:#2e7d32;
padding:12px 24px;
border-radius:8px;
text-decoration:none;
margin:10px;
display:inline-block;">
Start Reading
</a>
</div>

{% endblock %}
31 changes: 31 additions & 0 deletions _build/logs/myst.build.json
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@@ -0,0 +1,31 @@
{
"input": {
"files": [
"DISCOVER"
],
"opts": {
"execute": false,
"executeParallel": 11,
"pdf": false,
"tex": false,
"typst": false,
"docx": false,
"md": false,
"xml": false,
"meca": false,
"cff": false,
"site": false,
"html": false,
"all": false,
"doiBib": false,
"watch": false,
"force": false,
"checkLinks": false,
"strict": false,
"ci": false,
"maxSizeWebp": 1572864,
"keepHost": false
}
},
"exports": []
}