Home/Blocks/Error pages/404 Page

404 Page

A not-found page that keeps people on the site instead of bouncing.

ThemeMode
Theme tokens add once per site, shared by every block
:root {
  color-scheme: light dark;
  --color-primary: light-dark(#18181b, #fafafa);
  --color-accent: light-dark(#4f46e5, #818cf8);
  --color-bg: light-dark(#ffffff, #0b0b0d);
  --color-surface: light-dark(#f7f7f8, #161619);
  --color-text: light-dark(#0a0a0c, #f5f5f6);
  --color-text-muted: light-dark(#52525b, #a1a1aa);
  --color-border: light-dark(#e4e4e7, #26262b);
  --font-heading: 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.375rem;
  --text-4xl: 3.5rem;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 700;
  --leading-tight: 1.1;
  --leading-normal: 1.6;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;
  --radius: 0.625rem;
  --shadow: 0 1px 2px rgb(10 10 12 / 0.05), 0 4px 12px rgb(10 10 12 / 0.06), 0 16px 40px rgb(10 10 12 / 0.06);
  --container-width: 1120px;
}
Theme tokens add once per site, shared by every block
:root {
  color-scheme: light dark;
  --color-primary: light-dark(#4f46e5, #818cf8);
  --color-accent: light-dark(#a855f7, #c084fc);
  --color-bg: light-dark(#ffffff, #0c0c18);
  --color-surface: light-dark(#f5f5ff, #16162b);
  --color-text: light-dark(#111127, #ececf6);
  --color-text-muted: light-dark(#5a5a72, #9d9dbd);
  --color-border: light-dark(#e4e4f2, #28284a);
  --font-heading: 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.375rem;
  --text-4xl: 3.5rem;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 700;
  --leading-tight: 1.1;
  --leading-normal: 1.6;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;
  --radius: 0.75rem;
  --shadow: 0 1px 2px rgb(79 70 229 / 0.06), 0 6px 16px rgb(79 70 229 / 0.10), 0 20px 48px rgb(79 70 229 / 0.10);
  --container-width: 1120px;
}
Theme tokens add once per site, shared by every block
:root {
  color-scheme: light dark;
  --color-primary: light-dark(#0d9488, #2dd4bf);
  --color-accent: light-dark(#f97316, #fb923c);
  --color-bg: light-dark(#fbfaf8, #171412);
  --color-surface: light-dark(#f3f0ea, #221e1a);
  --color-text: light-dark(#292524, #ece7e0);
  --color-text-muted: light-dark(#6b6560, #a8a099);
  --color-border: light-dark(#e5dfd6, #37312a);
  --font-heading: Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.375rem;
  --text-4xl: 3.5rem;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 700;
  --leading-tight: 1.15;
  --leading-normal: 1.6;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;
  --radius: 1rem;
  --shadow: 0 2px 6px rgb(90 75 60 / 0.06), 0 10px 28px rgb(90 75 60 / 0.10);
  --container-width: 1120px;
}
HTML
<section class="s-error-404-centered">
  <div class="er-inner">
    <span class="er-code">404</span>
    <h1>This page wandered off</h1>
    <p>The link is broken or the page has moved. Either way, there is nothing here.</p>
    <div class="er-actions">
      <a class="er-btn er-btn-primary" href="#">Back to home</a>
      <a class="er-btn er-btn-ghost" href="#">Contact support</a>
    </div>
  </div>
</section>
CSS block only, works with any theme's tokens
.s-error-404-centered {
  background:
    radial-gradient(44rem 26rem at 50% -16%, color-mix(in srgb, var(--color-primary) 9%, transparent), transparent 62%),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  padding-block: var(--space-3xl);
}
.s-error-404-centered .er-inner {
  max-width: 560px;
  margin-inline: auto;
  padding-inline: var(--space-lg);
  text-align: center;
}
.s-error-404-centered .er-code {
  display: block;
  font-family: var(--font-heading);
  text-wrap: balance;
  font-size: clamp(5rem, 18vw, 9rem);
  font-weight: var(--weight-bold);
  line-height: 1;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--color-primary), color-mix(in srgb, var(--color-primary) 45%, var(--color-accent)));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: var(--space-md);
}
.s-error-404-centered h1 {
  font-family: var(--font-heading);
  text-wrap: balance;
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-sm);
}
.s-error-404-centered p {
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  text-wrap: pretty;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-lg);
}
.s-error-404-centered .er-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}
.s-error-404-centered .er-btn {
  display: inline-flex;
  align-items: center;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.s-error-404-centered .er-btn-primary {
  background: var(--color-primary);
  color: var(--color-bg);
  box-shadow: 0 1px 2px color-mix(in srgb, var(--color-text) 14%, transparent), 0 8px 20px color-mix(in srgb, var(--color-primary) 25%, transparent);
}
.s-error-404-centered .er-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 2px 4px color-mix(in srgb, var(--color-text) 14%, transparent), 0 12px 28px color-mix(in srgb, var(--color-primary) 32%, transparent);
}
.s-error-404-centered .er-btn-ghost {
  color: var(--color-text);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
}
.s-error-404-centered .er-btn-ghost:hover {
  border-color: color-mix(in srgb, var(--color-primary) 35%, var(--color-border));
  background: var(--color-surface);
}
Theme tokens add once per site, shared by every block
:root {
  color-scheme: light dark;
  --color-primary: light-dark(#18181b, #fafafa);
  --color-accent: light-dark(#4f46e5, #818cf8);
  --color-bg: light-dark(#ffffff, #0b0b0d);
  --color-surface: light-dark(#f7f7f8, #161619);
  --color-text: light-dark(#0a0a0c, #f5f5f6);
  --color-text-muted: light-dark(#52525b, #a1a1aa);
  --color-border: light-dark(#e4e4e7, #26262b);
  --font-heading: 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.375rem;
  --text-4xl: 3.5rem;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 700;
  --leading-tight: 1.1;
  --leading-normal: 1.6;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;
  --radius: 0.625rem;
  --shadow: 0 1px 2px rgb(10 10 12 / 0.05), 0 4px 12px rgb(10 10 12 / 0.06), 0 16px 40px rgb(10 10 12 / 0.06);
  --container-width: 1120px;
}
Theme tokens add once per site, shared by every block
:root {
  color-scheme: light dark;
  --color-primary: light-dark(#4f46e5, #818cf8);
  --color-accent: light-dark(#a855f7, #c084fc);
  --color-bg: light-dark(#ffffff, #0c0c18);
  --color-surface: light-dark(#f5f5ff, #16162b);
  --color-text: light-dark(#111127, #ececf6);
  --color-text-muted: light-dark(#5a5a72, #9d9dbd);
  --color-border: light-dark(#e4e4f2, #28284a);
  --font-heading: 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.375rem;
  --text-4xl: 3.5rem;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 700;
  --leading-tight: 1.1;
  --leading-normal: 1.6;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;
  --radius: 0.75rem;
  --shadow: 0 1px 2px rgb(79 70 229 / 0.06), 0 6px 16px rgb(79 70 229 / 0.10), 0 20px 48px rgb(79 70 229 / 0.10);
  --container-width: 1120px;
}
Theme tokens add once per site, shared by every block
:root {
  color-scheme: light dark;
  --color-primary: light-dark(#0d9488, #2dd4bf);
  --color-accent: light-dark(#f97316, #fb923c);
  --color-bg: light-dark(#fbfaf8, #171412);
  --color-surface: light-dark(#f3f0ea, #221e1a);
  --color-text: light-dark(#292524, #ece7e0);
  --color-text-muted: light-dark(#6b6560, #a8a099);
  --color-border: light-dark(#e5dfd6, #37312a);
  --font-heading: Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.375rem;
  --text-4xl: 3.5rem;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 700;
  --leading-tight: 1.15;
  --leading-normal: 1.6;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;
  --radius: 1rem;
  --shadow: 0 2px 6px rgb(90 75 60 / 0.06), 0 10px 28px rgb(90 75 60 / 0.10);
  --container-width: 1120px;
}
HTML
<section class="s-error-404-with-links">
  <div class="er-inner">
    <div class="er-copy">
      <span class="er-pill">404 — not found</span>
      <h1>Lost in the stylesheet</h1>
      <p>The page you asked for is gone or never existed. These usually help:</p>
      <ul class="er-links">
        <li><a href="#">Home</a> — start over from the top</li>
        <li><a href="#">Docs</a> — guides and reference</li>
        <li><a href="#">Blog</a> — the latest posts</li>
        <li><a href="#">Contact</a> — tell us what broke</li>
      </ul>
    </div>
    <div class="er-art"><span>?</span></div>
  </div>
</section>
CSS block only, works with any theme's tokens
.s-error-404-with-links {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  padding-block: var(--space-3xl);
}
.s-error-404-with-links .er-inner {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}
.s-error-404-with-links .er-pill {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--color-accent) 30%, var(--color-border));
  background: color-mix(in srgb, var(--color-accent) 8%, var(--color-bg));
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-md);
}
.s-error-404-with-links h1 {
  font-family: var(--font-heading);
  text-wrap: balance;
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: -0.025em;
  margin: 0 0 var(--space-sm);
}
.s-error-404-with-links p {
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  text-wrap: pretty;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-lg);
}
.s-error-404-with-links .er-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-sm);
}
.s-error-404-with-links .er-links li {
  font-size: var(--text-base);
  color: var(--color-text-muted);
}
.s-error-404-with-links .er-links a {
  color: var(--color-primary);
  font-weight: var(--weight-medium);
  text-decoration: none;
}
.s-error-404-with-links .er-links a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.s-error-404-with-links .er-art {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border-radius: var(--radius);
  background:
    radial-gradient(16rem 16rem at 70% 20%, color-mix(in srgb, var(--color-accent) 30%, transparent), transparent 60%),
    linear-gradient(150deg, var(--color-primary), color-mix(in srgb, var(--color-primary) 55%, var(--color-accent)));
  box-shadow: var(--shadow);
}
.s-error-404-with-links .er-art span {
  font-family: var(--font-heading);
  text-wrap: balance;
  font-size: clamp(5rem, 12vw, 8rem);
  font-weight: var(--weight-bold);
  color: var(--color-bg);
  opacity: 0.9;
}
@media (max-width: 768px) {
  .s-error-404-with-links .er-inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  .s-error-404-with-links .er-art {
    max-width: 260px;
  }
}
Modern CSS in this block

Baseline 2024 — works in every up-to-date browser.

  • color-mix()Newly availableMixing colors without a preprocessor
  • text-wrap: balanceNewly availableBalanced headlines without manual line breaks
  • text-wrap: prettyNewly availablePretty paragraph wrapping without orphan words
  • aspect-ratioWidely availableAspect ratios without the padding hack
  • clamp()Widely availableFluid typography without media queries

Plus universally supported features: logical properties, custom properties. Baseline status is pulled from each feature's reference snippet.

© 2026 modern.cssA project by Naeem Noor
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