@keyframes pulse {
  50% {
    transform: scale(1.5);
  }
}

[anim="pulse"]:not(.toggled) {
  animation: pulse cubic-bezier(.5,-0.25,.75,1) 1400ms infinite alternate;
}

.button-pulse {
  all: unset;
  color:white;
  background-color: black;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border: 1px solid red;
  box-shadow: 0 0 4px #cc0000;
  cursor: pointer;
  perspective: 1000px;
  position: relative;
  overflow: hidden;
}