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Crash Boundary Fallback

A copy-paste error & 404 pages component in pure HTML & CSS. Zero dependencies, framework-agnostic, MIT-licensed.

Error & 404 PagesHTMLCSSany framework

A component failed to render. You can reload or send us a report.

Copy into your project

HTML
<div class="nuda-ep2-crash-boundary">
  <div class="nuda-ep2-crash-boundary__icon" aria-hidden="true">
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor"
         stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
      <rect x="4" y="4" width="16" height="16" rx="2" />
      <path d="M4 4l7 7" />
      <path d="M20 20l-7-7" />
      <path d="M4 20l6-6" />
      <path d="M20 4l-6 6" />
    </svg>
  </div>
  <p class="nuda-ep2-crash-boundary__title" role="alert">The app crashed</p>
  <p class="nuda-ep2-crash-boundary__sub">A component failed to render. You can reload or send us a report.</p>
  <div class="nuda-ep2-crash-boundary__actions">
    <button class="nuda-ep2-crash-boundary__btn nuda-ep2-crash-boundary__btn--primary" type="button">Reload page</button>
    <button class="nuda-ep2-crash-boundary__btn" type="button">Report issue</button>
  </div>
</div>
CSS
.nuda-ep2-crash-boundary {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 22px 20px;
  background: #101010;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 16px;
  width: 100%;
  max-width: 260px;
  text-align: center;
  font-family: ui-sans-serif,system-ui;
}

.nuda-ep2-crash-boundary__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ff6b6b;
  background: rgba(255,107,107,.08);
  border: 1px solid rgba(255,107,107,.2);
  border-radius: 12px;
  margin-bottom: 4px;
  animation: _nuda-ep2crashboundary-glitch 3.2s ease-in-out infinite;
}

.nuda-ep2-crash-boundary__icon svg {
  width: 24px;
  height: 24px;
}

.nuda-ep2-crash-boundary__title {
  margin: 0;
  color: #fafafa;
  font-size: 14px;
  font-weight: 700;
}

.nuda-ep2-crash-boundary__sub {
  margin: 0;
  color: #8a8a8a;
  font-size: 11px;
  line-height: 1.5;
  max-width: 210px;
}

.nuda-ep2-crash-boundary__actions {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.nuda-ep2-crash-boundary__btn {
  min-height: 44px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.04);
  color: #cfcfcf;
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
}

.nuda-ep2-crash-boundary__btn:hover {
  background: rgba(255,255,255,.08);
}

.nuda-ep2-crash-boundary__btn:focus-visible {
  outline: 2px solid #e4ff54;
  outline-offset: 2px;
}

.nuda-ep2-crash-boundary__btn--primary {
  background: rgba(228,255,84,.1);
  border-color: rgba(228,255,84,.3);
  color: #e4ff54;
}

.nuda-ep2-crash-boundary__btn--primary:hover {
  background: rgba(228,255,84,.18);
}

@keyframes _nuda-ep2crashboundary-glitch {
  0%,88%,100% {
    transform: translate(0,0);
    filter: none;
  }
  90% {
    transform: translate(-1.5px,1px);
    filter: hue-rotate(15deg);
  }
  92% {
    transform: translate(1.5px,-1px);
    filter: hue-rotate(-10deg);
  }
  94% {
    transform: translate(0,0);
    filter: none;
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-ep2-crash-boundary__icon {
    animation: none;
  }
}

How to use Crash Boundary Fallback

Paste the HTML where you need it and the CSS into a global stylesheet (or a <style> tag). Every class is prefixed nuda- so it never collides with Tailwind or your own styles. Tweak the CSS custom properties to match your design system.

Works in React, Vue, Svelte, Astro, Next.js, Nuxt, Laravel Blade, Django, Rails — or a single .html file. No npm install, no build step.

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