Butterfly Wing Flutter Button

Instead of rigid rectangles, let’s create a button that feels like a living organism. Using border-radius we can shape butterfly wings, and transform-origin allows us to hinge them.

The Flapping Hinge

.wing {
  width: 50px;
  height: 80px;
  background: #f472b6;
  border-radius: 5px 50px 5px 50px; /* Wing shape */
  transition: transform 0.1s;
}

.wing.left { transform-origin: right center; }
.wing.right { transform-origin: left center; }

.button-wrap:hover .wing.left {
  animation: flapLeft 0.15s infinite alternate;
}

@keyframes flapLeft {
  from { transform: perspective(200px) rotateY(0deg); }
  to { transform: perspective(200px) rotateY(40deg); }
}

Move your mouse over the insect inside the Live Demo to see the wings violently and beautifully flutter!