.bubble {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
  transition: transform 0.1s ease-out;
}
.bubble1 {
  width: 25px;
  height: 25px;
  background-color: rgba(0, 150, 255, 0.4);
}
.bubble2 {
  width: 15px;
  height: 15px;
  background-color: rgba(255, 100, 200, 0.4);
}