非常简单好看的css3弹性波浪按钮动画特效，js结合css3属性实现鼠标悬停按钮动画效果，鼠标在按钮上移动按钮还会变换形状。

CSS样式

html, body { 
  height: 100%; 
  margin: 0;
}
  
body, #boxes div { 
  display: -webkit-box; 
  display: -ms-flexbox; 
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center; 
  -webkit-box-pack: center; 
      -ms-flex-pack: center; 
          justify-content: center;
}
  
body:after {
  z-index: -1;
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-transition: all .5s ease;
  transition: all .5s ease;
  background: var(--bg-color, #f44336);
  opacity: .1;
}
  
#boxes {
  counter-reset: number;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}
  
@media (max-width: 320px) {
  #boxes {
    grid-template-columns: repeat(2, 1fr);
  }
}
  
#boxes div {
  counter-increment: number;
  width: 10vw;
  height: 10vw;
  min-width: 5em;
  min-height: 5em;
  -webkit-transition: .5s all ease;
  transition: .5s all ease;
  background: var(--color, #aaa);
  border: 0 solid transparent;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  border-radius: 50%;
  margin: .5em;
  opacity: .7;
  --dx: calc(var(--size) - var(--x));
  --dy: calc(var(--size) - var(--y));
}
  
body:not([style]) #boxes div:first-child {
  --x: 84;
  --y: 75;
  --size: 128;
}
  
body:not([style]) #boxes div:first-child,
#boxes div:hover {
  opacity: 1;
  cursor: pointer;
  border: calc(2px + .85vw) solid rgba(255, 255, 255, .5);
  -webkit-transition:
    .5s background-color ease,
    .2s border ease;
  transition:
    .5s background-color ease,
    .2s border ease;
  
  border-radius:
    calc(var(--x) / var(--size) * 100%) 
    calc(var(--dx) / var(--size) * 100%)
    calc(var(--dx) / var(--size) * 100%) 
    calc(var(--x) / var(--size) * 100%) / 
    calc(var(--y) / var(--size) * 100%) 
    calc(var(--y) / var(--size) * 100%) 
    calc(var(--dy) / var(--size) * 100%) 
    calc(var(--dy) / var(--size) * 100%) 
}
  
body:not([style]) #boxes div:first-child:after,
#boxes div:after {
  content: counter(number);
  color: rgba(255, 255, 255, 0);
  font-size: calc(1vw + 1.2em);
  font-weight: 200;
  -webkit-transition: all .2s ease;
  transition: all .2s ease;
  -webkit-transition-delay: .1s;
          transition-delay: .1s;
  -webkit-transform: translate3d(0, -.5em, 0);
          transform: translate3d(0, -.5em, 0);
}
  
body:not([style]) #boxes div:first-child:after,
#boxes div:hover:after {
  color: rgba(255, 255, 255, .7);
  -webkit-transform: translate3d(0, 0, 0);
          transform: translate3d(0, 0, 0);
}