橡胶泡泡，纯CSS

            
            :root {
  --main-bg: #000;
  --pink: 255, 0, 89;
  --violet: 186, 0, 253;
  --blue: 0, 165, 253;
  --yellow: 255, 200, 0;
  --light: 255, 255, 255;
  --alpha: .5;
}

html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  min-height: 100vh;
  background-color: var(--main-bg);
}

.bubble {
  position: relative;
  width: 20rem;
  height: 20rem;
  border-radius: 50%;
     box-shadow: inset 0 0 2rem rgba(var(--light), 1), 
       inset 2rem 0 4rem rgba(var(--pink), 1),
       inset -2rem 0 6rem rgba(var(--blue), 1),
       inset 0 4rem 4rem rgba(var(--violet), 1),
       inset 0 -2rem 2rem rgba(var(--yellow), 1),
       inset 2rem -2rem 1rem rgba(var(--yellow), 1),
       0 0 4rem rgba(var(--light), .2),
       2rem 0 8rem rgba(var(--pink), var(--alpha)),
       -2rem 0 8rem rgba(var(--blue), var(--alpha)),
       0 4rem 8rem rgba(var(--violet), var(--alpha)),
       0 -2rem 8rem rgba(var(--yellow), var(--alpha));
  animation: floating 3s ease-in-out infinite;
  cursor: pointer;
}

.bubble.animated {
  animation: rubber 1s linear;
}

@keyframes rubber {
  from {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }

  30% {
    -webkit-transform: scale3d(1.25, 0.75, 1);
    transform: scale3d(1.25, 0.75, 1);
  }

  40% {
    -webkit-transform: scale3d(0.75, 1.25, 1);
    transform: scale3d(0.75, 1.25, 1);
  }

  50% {
    -webkit-transform: scale3d(1.15, 0.85, 1);
    transform: scale3d(1.15, 0.85, 1);
  }

  65% {
    -webkit-transform: scale3d(0.95, 1.05, 1);
    transform: scale3d(0.95, 1.05, 1);
  }

  75% {
    -webkit-transform: scale3d(1.05, 0.95, 1);
    transform: scale3d(1.05, 0.95, 1);
  }

  to {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

@media (max-width: 768px) {
  html {
    font-size: 10px;
  }
}

@keyframes floating {
  from {
    transform: translate(0, 0);
  }
  65% {
    transform: translate(0, 1rem);
  }
  to {
    transform: translate(0, 0);
  }
}

.bubble::before,
.bubble::after {
  content: "";
  position: absolute;
  display: block;
  border-radius: 100%;
  transform: rotate(40deg);
}

.bubble::before {
  top: 2rem;
  right: 2rem;
  width: 5rem;
  height: 2rem;
  background-color: rgba(var(--light),1);
  background: radial-gradient(closest-side, rgba(var(--light), .7) 50%, transparent 100%);
}

.bubble::after {
  bottom: 1.5rem;
  left: 1.5rem;
  width: 10rem;
  height: 5rem;
  background: radial-gradient(closest-side, rgba(var(--light), .3) 50%, transparent 100%);
}
        

            
            const bubble = document.querySelector(".bubble");

bubble.addEventListener("click", function (evt) {
  evt.preventDefault();
  bubble.classList.add("animated");
  setTimeout(function () {
    bubble.classList.remove("animated");
  }, 1000);
});