效果图： 

<template>
  <div style="width: 100%;height:500px;padding:20px;">
    <div class="water"></div>
  </div>
</template>
<script>
export default {
  data() {
    return {};
  },
  watch: {},
  created() {},
  methods: {},
};
</script>
<style lang='less' scoped>
.water {
  width: 300px;
  height: 300px;
  box-shadow: 10px 20px 30px 0px rgba(0, 0, 0, 0.2) inset,
              10px 20px 30px rgba(0,0,0,0.3),
              15px 15px 30px rgba(0,0,0,0.05),
              -15px -15px 30px rgba(255,255,255,0.8) inset;
  border-radius: 59% 41% 71% 29% / 54% 43% 57% 46% ;
  margin: 0 auto;
  margin-top:300px;
  /**
  box-sizing 用于控制元素的盒模型，决定了元素的宽度和高度是如何计算的；
  默认值是content-box, 元素的宽度和高度只包含内容区域，
  border-box , 元素的宽度和高度包含内容区域，内边距，边框；
   */
  box-sizing: border-box;
  animation: action 3s linear infinite;
}
@keyframes action {
  0%{
    border-radius: 59% 41% 71% 29% / 54% 43% 57% 46% ;
  }
  25%{
    border-radius:43% 57% 55% 45% / 63% 37% 63% 37% ;
  }
  50%{

    border-radius:37% 63% 39% 61% / 69% 26% 74% 31% ;
  }
  75%{
    border-radius:53% 47% 44% 56% / 50% 58% 42% 50%  ;
  }
  100%{
    border-radius: 59% 41% 71% 29% / 54% 43% 57% 46% ;
  }
}
</style>