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Added 2 Sept 2026
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callout-tail-frame-15891
Callout Tail Frame
Borders & Outlines

Callout Tail Frame

Tooltip outline whose pointer is a rotated square carrying two of the four border sides, its fill blanking the panel stroke behind it so the hairline runs unbroken into the tail — which slides the length of the edge on hover.

Borders & Outlinescallouttooltiptailpointeroutline
lines of CSS
37lines of CSS
dependencies
0dependencies
browser, for years
Everybrowser, for years
motion only on interaction
Hovermotion only on interaction
Backdrop
Keyboard shortcutPress ⌘K to search
Open a live copy in

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

callout-tail-frame-15891.css
.fx-v14-bo-callout-15890 {
  position: relative;
  width: 216px;
  margin-bottom: 10px;
  padding: 0.6rem 0.75rem 0.65rem;
  border: 1px solid #3f6ea8;
  border-radius: 0.5rem;
  background: #101c33;
  font-family: system-ui, sans-serif;
}
.fx-v14-bo-callout-15890 b {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  color: #e2e8f0;
}
.fx-v14-bo-callout-15890 em {
  display: block;
  margin-top: 0.15rem;
  font-style: normal;
  font-size: 0.63rem;
  color: #7dd3fc;
}
.fx-v14-bo-callout-15890 .tl {
  position: absolute;
  left: 22px;
  bottom: -7px;
  width: 12px;
  height: 12px;
  background: #101c33;
  border-right: 1px solid #3f6ea8;
  border-bottom: 1px solid #3f6ea8;
  border-bottom-right-radius: 2px;
  transform: rotate(45deg);
  transition: left 0.45s cubic-bezier(0.65, 0, 0.35, 1);
}
.fx-v14-bo-callout-15890:hover .tl { left: 180px; }
callout-tail-frame-15891.html
<div class="fx-v14-bo-callout-15890">
  <b>Keyboard shortcut</b>
  <em>Press ⌘K to search</em>
  <i class="tl"></i>
</div>

What do I do with this?

  1. Put callout-tail-frame-15891.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-v14-bo-callout-15890">. 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 callout-tail-frame-15891

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 callout-tail-frame-15891

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.

Was this useful?

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 left. 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 left 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 Callout Tail Frame

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