CSS呼吸<按钮>停止文本抖动

.centered {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) 
}

button.circle {
  width: 65vh;
  height: 65vh;
  border: 0;
  background-color: transparent;
}

button.circle::after {
  z-index: -1;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  content: '';
  display: block;
  background: teal;
  border-radius: 100%;
  animation: breathe 4.5s ease infinite alternate running;
}

@keyframes breathe {
  from { transform: scale(1); }
  to { transform: scale(1.4); }
}

<a href="https://www.w3schools.com"><button class="circle centered">Click me</button></a>

body,
html {
  height: 100%;
  display: grid;
}

.circle-outer {
  margin: auto;
  text-align: center;
}

button.circle {
  --startSize: 65vh;
  --endSize: 85vh;
  width: var(--startSize);
  height: var(--startSize);
  background: teal;
  border-radius: 100%;
  animation-name: breathe;
  animation-play-state: running;
  animation-duration: 4.5s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  border: none;
}

@keyframes breathe {
  0% {
    width: var(--startSize);
    height: var(--startSize);
  }
  25% {
    width: var(--startSize);
    height: var(--startSize);
  }
  75% {
    width: var(--endSize);
    height: var(--endSize);
  }
  100% {
    width: var(--endSize);
    height: var(--endSize);
  }
}

<div class="circle-outer">
  <a href="https://www.w3schools.com"><button class="circle">Click me</button></a>
</div>