.kalda-blink-button {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: radial-gradient(circle, red, yellow, green);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: blink 2s infinite;
  z-index: 9999;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}