36 CSS Button Hover Effects04 / 36

Pure CSSMIT licensed

SVG Organic Blob Morph

A playful CTA that starts as a soft organic blob and, on hover, resolves into a clean structured pill — great for creative studios and friendly product pages. Pure CSS using an animatable multi-point border-radius.

Published

Live Demo
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The code

<div class="bhe-04-group">
<section class="bhe-04a" aria-label="Blob morph button">
  <button class="bhe-04a__btn" type="button">Say hello</button>
</section>
<section class="bhe-04b" aria-label="Squircle morph button">
  <button class="bhe-04b__btn" type="button" aria-label="Play"><span aria-hidden="true">▶</span></button>
</section>
</div>
.bhe-04-group {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-wrap: wrap;
}

.bhe-04-group > section {
  flex: 1 1 340px;
  min-width: 300px;
}

.bhe-04a,
.bhe-04a *,
.bhe-04a *::before,
.bhe-04a *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.bhe-04a {
  --accent: oklch(0.68 0.17 25);
  font-family: 'Segoe UI',system-ui,sans-serif;
  width: 100%;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 56px 24px;
  background: radial-gradient(120% 120% at 30% 0%,#fff3ec,#ffe1d3);
}

.bhe-04a__btn {
  display: grid;
  place-items: center;
  min-width: 180px;
  font-size: 17px;
  font-weight: 800;
  color: #fff;
  padding: 24px 40px;
  border: none;
  cursor: pointer;
  background: linear-gradient(150deg,color-mix(in oklab,var(--accent) 82%,white),var(--accent));
  box-shadow: 0 18px 36px -16px color-mix(in oklab,var(--accent) 70%,transparent);
  border-radius: 42% 58% 63% 37% / 45% 38% 62% 55%;
  animation: bhe-04a-breathe 7s ease-in-out infinite;
  transition: border-radius .6s cubic-bezier(.2,.9,.2,1),transform .3s;
}

.bhe-04a__btn:hover,
.bhe-04a__btn:focus-visible {
  border-radius: 9999px;
  transform: translateY(-3px);
  animation-play-state: paused;
}

.bhe-04a__btn:active {
  transform: translateY(0) scale(.97);
}

.bhe-04a__btn:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

@keyframes bhe-04a-breathe {
  0%,
    100% {
    border-radius: 42% 58% 63% 37% / 45% 38% 62% 55%;
  }

  50% {
    border-radius: 60% 40% 38% 62% / 55% 62% 38% 45%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bhe-04a__btn {
    animation: none;
    transition: transform .2s;
  }
}

.bhe-04b,
.bhe-04b *,
.bhe-04b *::before,
.bhe-04b *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.bhe-04b {
  --accent: oklch(0.62 0.18 300);
  font-family: 'Segoe UI',system-ui,sans-serif;
  width: 100%;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 56px 24px;
  background: #141020;
}

.bhe-04b__btn {
  display: grid;
  place-items: center;
  width: 96px;
  height: 96px;
  font-size: 26px;
  color: #fff;
  border: none;
  cursor: pointer;
  background: linear-gradient(150deg,color-mix(in oklab,var(--accent) 80%,white),var(--accent));
  box-shadow: 0 18px 40px -16px var(--accent);
  border-radius: 34% 66% 62% 38% / 40% 42% 58% 60%;
  transition: border-radius .55s cubic-bezier(.2,.9,.2,1),transform .35s;
}

.bhe-04b__btn:hover,
.bhe-04b__btn:focus-visible {
  border-radius: 50%;
  transform: scale(1.08);
}

.bhe-04b__btn:active {
  transform: scale(.96);
}

.bhe-04b__btn:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .bhe-04b__btn {
    transition: transform .2s;
  }
}
/* No JavaScript — pure CSS; all designs for this title are driven entirely by the css field. */
Paste this into ChatGPT, Claude, Cursor, or any coding assistant. The block below is pre-framed with everything the AI needs to integrate this demo into your project — markup, styles, scoping notes, and the source URL. Hit Copy and paste straight into your chat.
Here's a working CSS Button Hover Effect from CodeFronts. Use it as-is or adapt to your framework. All classes are scoped under a unique prefix so the code won't collide with your existing styles. MIT licensed.
Demo: SVG Organic Blob Morph
Source: https://codefronts.com/motion/css-button-hover-effects/svg-organic-blob-morph/

A playful CTA that starts as a soft organic blob and, on hover, resolves into a clean structured pill — great for creative studios and friendly product pages. Pure CSS using an animatable multi-point border-radius.
## HTML
```html
<div class="bhe-04-group">
<section class="bhe-04a" aria-label="Blob morph button">
  <button class="bhe-04a__btn" type="button">Say hello</button>
</section>
<section class="bhe-04b" aria-label="Squircle morph button">
  <button class="bhe-04b__btn" type="button" aria-label="Play"><span aria-hidden="true">▶</span></button>
</section>
</div>
```
## CSS
```css
.bhe-04-group {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-wrap: wrap;
}

.bhe-04-group > section {
  flex: 1 1 340px;
  min-width: 300px;
}

.bhe-04a,
.bhe-04a *,
.bhe-04a *::before,
.bhe-04a *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.bhe-04a {
  --accent: oklch(0.68 0.17 25);
  font-family: 'Segoe UI',system-ui,sans-serif;
  width: 100%;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 56px 24px;
  background: radial-gradient(120% 120% at 30% 0%,#fff3ec,#ffe1d3);
}

.bhe-04a__btn {
  display: grid;
  place-items: center;
  min-width: 180px;
  font-size: 17px;
  font-weight: 800;
  color: #fff;
  padding: 24px 40px;
  border: none;
  cursor: pointer;
  background: linear-gradient(150deg,color-mix(in oklab,var(--accent) 82%,white),var(--accent));
  box-shadow: 0 18px 36px -16px color-mix(in oklab,var(--accent) 70%,transparent);
  border-radius: 42% 58% 63% 37% / 45% 38% 62% 55%;
  animation: bhe-04a-breathe 7s ease-in-out infinite;
  transition: border-radius .6s cubic-bezier(.2,.9,.2,1),transform .3s;
}

.bhe-04a__btn:hover,
.bhe-04a__btn:focus-visible {
  border-radius: 9999px;
  transform: translateY(-3px);
  animation-play-state: paused;
}

.bhe-04a__btn:active {
  transform: translateY(0) scale(.97);
}

.bhe-04a__btn:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

@keyframes bhe-04a-breathe {
  0%,
    100% {
    border-radius: 42% 58% 63% 37% / 45% 38% 62% 55%;
  }

  50% {
    border-radius: 60% 40% 38% 62% / 55% 62% 38% 45%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bhe-04a__btn {
    animation: none;
    transition: transform .2s;
  }
}

.bhe-04b,
.bhe-04b *,
.bhe-04b *::before,
.bhe-04b *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.bhe-04b {
  --accent: oklch(0.62 0.18 300);
  font-family: 'Segoe UI',system-ui,sans-serif;
  width: 100%;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 56px 24px;
  background: #141020;
}

.bhe-04b__btn {
  display: grid;
  place-items: center;
  width: 96px;
  height: 96px;
  font-size: 26px;
  color: #fff;
  border: none;
  cursor: pointer;
  background: linear-gradient(150deg,color-mix(in oklab,var(--accent) 80%,white),var(--accent));
  box-shadow: 0 18px 40px -16px var(--accent);
  border-radius: 34% 66% 62% 38% / 40% 42% 58% 60%;
  transition: border-radius .55s cubic-bezier(.2,.9,.2,1),transform .35s;
}

.bhe-04b__btn:hover,
.bhe-04b__btn:focus-visible {
  border-radius: 50%;
  transform: scale(1.08);
}

.bhe-04b__btn:active {
  transform: scale(.96);
}

.bhe-04b__btn:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .bhe-04b__btn {
    transition: transform .2s;
  }
}
```

## JavaScript
```js
/* No JavaScript — pure CSS; all designs for this title are driven entirely by the css field. */
```

How this works

An 8-value border-radius reads as a hand-drawn blob and a slow keyframe makes it breathe. On :hover the radius transitions to a symmetric pill so the wobble resolves into geometry.

For literal vector morphing you can transition an inline SVG path d in Chromium — the border-radius approach morphs identically everywhere.

Make it yours

  • Swap in an SVG path-d morph for true vector shapes (Chromium; keep this as fallback).
  • Edit the blob radius stops for a different personality.
  • Pause the idle breathing by removing the animation.
  • Recolour via --accent.

Gotchas — read before shipping

  • Multi-value border-radius animates only between two same-syntax forms.
  • Don't animate width to reshape; let border-radius do it.
  • Center the label with flex, not absolute offsets, so it stays put while breathing.

Browser support

ChromeSafariFirefoxEdge
111+16.2+113+111+

Floor set by oklch(), color-mix() as this demo is written. The core technique itself goes back further — Chrome 55+.

Multi-value border-radius transitions are universal; the optional SVG path-d morph is Chromium-only today.

Techniques used in this demo

color-mix()MDN ↗radial-gradient()MDN ↗@keyframesMDN ↗place-items / place-contentMDN ↗oklch()MDN ↗

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