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Added 2 Aug 2026
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blue-corner-bracket-border-3379
Blue Corner Bracket Border
Borders & Outlines

Blue Corner Bracket Border

Two blue corner brackets that grow into a full frame on hover.

Borders & Outlinesbordercornerbrackethoverblue
lines of CSS
24lines of CSS
dependencies
0dependencies
browser, for years
Everybrowser, for years
motion only on interaction
Hovermotion only on interaction
Backdrop
Hover me
Open a live copy in

Vue, Svelte, styled-components and Tailwind exports are part of Pro. HTML, CSS and React are free forever.

blue-corner-bracket-border-3379.css
.fx-bd-corner-blue-3378 {
  position: relative;
  padding: 1.3rem 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #e2e8f0;
  background: #0f172a;
}
.fx-bd-corner-blue-3378::before,
.fx-bd-corner-blue-3378::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  border: 2px solid #3b82f6;
  transition: width 0.35s ease, height 0.35s ease;
}
.fx-bd-corner-blue-3378::before { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.fx-bd-corner-blue-3378::after  { bottom: 0; right: 0; border-left: 0; border-top: 0; }
.fx-bd-corner-blue-3378:hover::before,
.fx-bd-corner-blue-3378:hover::after {
  width: calc(100% - 4px);
  height: calc(100% - 4px);
}
blue-corner-bracket-border-3379.html
<div class="fx-bd-corner-blue-3378">Hover me</div>

What do I do with this?

  1. Put blue-corner-bracket-border-3379.css anywhere your page already loads CSS from — in Next.js that is app/globals.css, or any stylesheet with a <link> in your HTML.
  2. Then put the class on the element you want it on: <button class="fx-bd-corner-blue-3378">. The CSS does nothing until a class name in it matches something on the page.
  • Link the stylesheet, then paste the markup wherever you need it.
npx hoverlab add blue-corner-bracket-border-3379

What's included

  • The markup and the stylesheet, in whichever framework you pick
  • No runtime dependencies

Works with

  • React
  • Vue
  • Svelte
  • Tailwind
  • styled-components
  • Plain CSS

npx hoverlab add blue-corner-bracket-border-3379

Or over MCP, from your editor's agent — no account needed.

License

Free to read, copy and install, for personal and non-commercial projects. Shipping it in client work or a paid product needs Pro ($79 once). The source lands in your repo and stops being ours — no attribution, nothing to upgrade.

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Motion safety

Static estimate, read from the CSS

Reduced motion
Brief motion, no guard

Animates briefly or on interaction. Only looping motion gets a guard in this catalog; copy the one from the Insights tab if this ships on a critical path.

What it animates
Reflows

Animates height, width. The browser re-lays-out the page on every frame; prefer transform if you can.

Flashing (WCAG 2.3.1)
No flashing found

No repeating change in opacity, colour or brightness large enough to count as a flash.

Layout shift (CLS)
May shift layout

Animates height, width on a box in flow, so content beside or after it can move. A category from the CSS, not a measurement for this effect.

Every row is read from the shipped CSS. Only a figure marked measured came from a browser. Customizing the speed changes the timing, so recheck a customized copy. How it is computed

29 more effects in Borders & Outlines

All of them free to read, copy and install — no account, no locked tiles, no watermarked preview. The whole catalog is open, and so are the API and the CLI.

Browse Borders & Outlines

Shipping one commercially

Copying the code is free. Putting it in client work or a paid product is what Pro is for — the licence, not the access.

  • A commercial licence for everything in the catalog
  • Unlimited bundle exports, in Vue, Svelte and Tailwind
  • One payment — no subscription, nothing to renew
Pro — $79 once

7 variations of Blue Corner Bracket Border

Finished looks, each one a position in the customizer above. Copy any of them, or open it and keep moving the sliders.