css 闪烁白点

.image_zone_touch {
  box-sizing: border-box;
  position: absolute;
  width: 16vw;
  height: 16vw;
  background-color: transparent;
  border-radius: 50%;
  animation: whitePulse 0.618s infinite;
  animation-direction: alternate;
}

/* 涟漪动画关键帧 */
@keyframes whitePulse {
  0% {
    border: 25rpx double #ffffff28;
    opacity: 1;
  }

  100% {
    opacity: 1;
    border: 0px dashed transparent;
  }
}