Blob morph

Blob morph: a CSS button. Copy the rules, or the prompt that rebuilds it.

liquidblobmorphborder-radiusorganic

CSS
.btn-111 {
  font: 700 15px/1 system-ui,sans-serif;
  color: #fff;
  background: #0ea5e9;
  border: 0;
  border-radius: 60% 40% 30% 70%/60% 30% 70% 40%;
  padding: 18px 34px;
  cursor: pointer;
  transition: border-radius .6s ease-in-out,background .3s
}
.btn-111:hover {
  border-radius: 30% 60% 70% 40%/50% 60% 30% 60%;
  background: #0284c7
}
.btn-111:focus-visible {
  outline: 3px solid #0ea5e9;
  outline-offset: 4px
}
.btn-111:active {
  border-radius: 50%/50%;
  background: #0369a1
}
HTML
<button class="btn-111">Splash</button>
Prompt

A sky-blue #0ea5e9 button shaped like an organic blob using an asymmetric 8-value border-radius (60% 40% 30% 70% / 60% 30% 70% 40%), white 15px bold text, 18px by 34px padding. On hover the radius morphs over 600ms to a different blob shape and the colour deepens to #0284c7; active snaps to an ellipse and #0369a1. Focus 3px blue outline offset 4px.